# What is CVE-2021-36283? > CVE-2021-36283 is a medium-severity flaw (CVSS 6.7) in Chengming 3990 Firmware from Dell, published on 28 September 2021. It is not on the list of flaws known to be exploited today. The latest forecast puts its chance of use in the next 30 days at 0.2%. If you run an affected version, plan in the vendor’s fix. Canonical page: https://www.precursorintelligence.com/what-is/cve-2021-36283 ## At a glance - **Verdict:** Plan it in. No sign of exploitation and a low forecast. Patch it in your normal update cycle. - **Precursor Intelligence risk score:** 45 out of 100 (Medium); action: Plan remediation. Kept up to date as the evidence changes. - **Severity:** Medium (CVSS 6.7 out of 10) - **Known to be exploited:** No, not on the list of flaws known to be exploited today - **Chance of use in the next 30 days:** 0.2% (latest exploit-likelihood forecast) - **Published:** 28 September 2021 - **Record last updated:** 4 October 2021 - **Main product:** Chengming 3990 Firmware from Dell - **Affected products:** 170 ## What is CVE-2021-36283? In plain terms An attacker has to be already on the device with an administrator account, and nobody has to click anything. If it works, the attacker can read data, change data and take it offline. ### The official description Dell BIOS contains an improper input validation vulnerability. A local authenticated malicious user may potentially exploit this vulnerability by using an SMI to gain arbitrary code execution in SMRAM. ### What kind of flaw is it? - CWE-20: Improper Input Validation ### How an attack on it works - Where an attacker can be: Already on the device - How hard it is to pull off: Easy: no special conditions - Login needed first: An administrator account - Does someone have to click: No, nobody has to do anything - What an attacker gets: Can read data, change data and take it offline Severity vector: `CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H` ## Is CVE-2021-36283 being exploited? Not that we know of It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 0.2%. That can change at any time, which is why we keep watching. Exploit likelihood over the last 7 days: 0.2%, 0.2%, 0.2%, 0.2%, 0.2%, 0.2%, 0.2%. ### Timeline - 28 September 2021: Published - 4 October 2021: Record last updated ### How Precursor Intelligence ranks it CVE-2021-36283 scores **45 out of 100 (Medium)**, with the action "Plan remediation". Every published flaw gets a risk score from 0 to 100, kept up to date as the evidence changes. Four things go into the score, from the one that counts most to the ones that count less: - Evidence it is being exploited: biggest factor - How severe it is: strong factor - How widely exposed it is: key context - Real threat activity around it: key context 85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score. When this flaw matches software you track, it lands in your list with its score and the reasons behind it. ## Who is affected by CVE-2021-36283? The published record lists 170 products. Versions are as published: "before 1.3.1" means every version up to, but not including, 1.3.1. - [Chengming 3990 Firmware](https://www.precursorintelligence.com/product/dell/chengming_3990_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.3.1 - [Chengming 3990](https://www.precursorintelligence.com/product/dell/chengming_3990) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Chengming 3991](https://www.precursorintelligence.com/product/dell/chengming_3991) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Chengming 3991 Firmware](https://www.precursorintelligence.com/product/dell/chengming_3991_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.3.1 - [G3 15 3500](https://www.precursorintelligence.com/product/dell/g3_15_3500) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [G3 15 3500 Firmware](https://www.precursorintelligence.com/product/dell/g3_15_3500_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.7.1 - [G3 15 3590](https://www.precursorintelligence.com/product/dell/g3_15_3590) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [G3 15 3590 Firmware](https://www.precursorintelligence.com/product/dell/g3_15_3590_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.12.0 - [G3 15 5500](https://www.precursorintelligence.com/product/dell/g3_15_5500) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [G3 15 5500 Firmware](https://www.precursorintelligence.com/product/dell/g3_15_5500_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.7.1 - [Inspiron 3493](https://www.precursorintelligence.com/product/dell/inspiron_3493) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Inspiron 3493 Firmware](https://www.precursorintelligence.com/product/dell/inspiron_3493_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.12.0 - [Inspiron 3501](https://www.precursorintelligence.com/product/dell/inspiron_3501) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Inspiron 3501 Firmware](https://www.precursorintelligence.com/product/dell/inspiron_3501_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.1.0 - [Inspiron 3593](https://www.precursorintelligence.com/product/dell/inspiron_3593) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Inspiron 3593 Firmware](https://www.precursorintelligence.com/product/dell/inspiron_3593_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.12.0 - [Inspiron 3793](https://www.precursorintelligence.com/product/dell/inspiron_3793) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Inspiron 3793 Firmware](https://www.precursorintelligence.com/product/dell/inspiron_3793_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.12.0 - [Inspiron 3880](https://www.precursorintelligence.com/product/dell/inspiron_3880) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Inspiron 3880 Firmware](https://www.precursorintelligence.com/product/dell/inspiron_3880_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.3.1 - [Inspiron 3881](https://www.precursorintelligence.com/product/dell/inspiron_3881) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Inspiron 3881 Firmware](https://www.precursorintelligence.com/product/dell/inspiron_3881_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.3.1 - [Inspiron 5400 2-in-1](https://www.precursorintelligence.com/product/dell/inspiron_5400_2-in-1) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Inspiron 5400 2-in-1 Firmware](https://www.precursorintelligence.com/product/dell/inspiron_5400_2-in-1_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.5.0 - [Inspiron 5490](https://www.precursorintelligence.com/product/dell/inspiron_5490) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Inspiron 5490 Firmware](https://www.precursorintelligence.com/product/dell/inspiron_5490_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.12.0 - [Inspiron 5493](https://www.precursorintelligence.com/product/dell/inspiron_5493) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Inspiron 5493 Firmware](https://www.precursorintelligence.com/product/dell/inspiron_5493_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.12.0 - [Inspiron 5498](https://www.precursorintelligence.com/product/dell/inspiron_5498) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Inspiron 5498 Firmware](https://www.precursorintelligence.com/product/dell/inspiron_5498_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.12.0 - [Inspiron 5590](https://www.precursorintelligence.com/product/dell/inspiron_5590) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Inspiron 5590 Firmware](https://www.precursorintelligence.com/product/dell/inspiron_5590_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.12.0 - [Inspiron 5593](https://www.precursorintelligence.com/product/dell/inspiron_5593) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Inspiron 5593 Firmware](https://www.precursorintelligence.com/product/dell/inspiron_5593_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.12.0 - [Inspiron 5598](https://www.precursorintelligence.com/product/dell/inspiron_5598) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Inspiron 5598 Firmware](https://www.precursorintelligence.com/product/dell/inspiron_5598_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.12.0 - [Inspiron 7391 2-in-1](https://www.precursorintelligence.com/product/dell/inspiron_7391_2-in-1) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Inspiron 7391 2-in-1 Firmware](https://www.precursorintelligence.com/product/dell/inspiron_7391_2-in-1_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.9.1 - [Inspiron 7500](https://www.precursorintelligence.com/product/dell/inspiron_7500) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Inspiron 7500 2-in-1 Silver](https://www.precursorintelligence.com/product/dell/inspiron_7500_2-in-1_silver) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Inspiron 7500 2-in-1 Silver Firmware](https://www.precursorintelligence.com/product/dell/inspiron_7500_2-in-1_silver_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.5.0 - [Inspiron 7500 Firmware](https://www.precursorintelligence.com/product/dell/inspiron_7500_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.5.1 - [Inspiron 7501](https://www.precursorintelligence.com/product/dell/inspiron_7501) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Inspiron 7501 Firmware](https://www.precursorintelligence.com/product/dell/inspiron_7501_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.5.1 - [Inspiron 7590](https://www.precursorintelligence.com/product/dell/inspiron_7590) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Inspiron 7590 Firmware](https://www.precursorintelligence.com/product/dell/inspiron_7590_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.8.0 - [Inspiron 7591](https://www.precursorintelligence.com/product/dell/inspiron_7591) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Inspiron 7591 Firmware](https://www.precursorintelligence.com/product/dell/inspiron_7591_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.8.0 - [Latitude 3310](https://www.precursorintelligence.com/product/dell/latitude_3310) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 3310 2-in-1](https://www.precursorintelligence.com/product/dell/latitude_3310_2-in-1) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 3310 2-in-1 Firmware](https://www.precursorintelligence.com/product/dell/latitude_3310_2-in-1_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.17.1 - [Latitude 3310 Firmware](https://www.precursorintelligence.com/product/dell/latitude_3310_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.8.3 - [Latitude 5300](https://www.precursorintelligence.com/product/dell/latitude_5300) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 5300 2-in-1](https://www.precursorintelligence.com/product/dell/latitude_5300_2-in-1) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 5300 2-in-1 Firmware](https://www.precursorintelligence.com/product/dell/latitude_5300_2-in-1_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.12.1 - [Latitude 5300 Firmware](https://www.precursorintelligence.com/product/dell/latitude_5300_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.12.1 - [Latitude 5310](https://www.precursorintelligence.com/product/dell/latitude_5310) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 5310 2 in 1](https://www.precursorintelligence.com/product/dell/latitude_5310_2_in_1) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 5310 2 in 1 Firmware](https://www.precursorintelligence.com/product/dell/latitude_5310_2_in_1_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): 1.4.2 - [Latitude 5310 Firmware](https://www.precursorintelligence.com/product/dell/latitude_5310_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.4.2 - [Latitude 5400](https://www.precursorintelligence.com/product/dell/latitude_5400) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 5400 Firmware](https://www.precursorintelligence.com/product/dell/latitude_5400_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.10.1 - [Latitude 5401](https://www.precursorintelligence.com/product/dell/latitude_5401) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 5401 Firmware](https://www.precursorintelligence.com/product/dell/latitude_5401_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.11.1 - [Latitude 5410](https://www.precursorintelligence.com/product/dell/latitude_5410) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 5410 Firmware](https://www.precursorintelligence.com/product/dell/latitude_5410_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.4.3 - [Latitude 5411](https://www.precursorintelligence.com/product/dell/latitude_5411) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 5411 Firmware](https://www.precursorintelligence.com/product/dell/latitude_5411_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.4.3 - [Latitude 5500](https://www.precursorintelligence.com/product/dell/latitude_5500) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 5500 Firmware](https://www.precursorintelligence.com/product/dell/latitude_5500_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.10.1 - [Latitude 5511](https://www.precursorintelligence.com/product/dell/latitude_5511) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 5511 Firmware](https://www.precursorintelligence.com/product/dell/latitude_5511_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.4.3 - [Latitude 7200 2 in 1](https://www.precursorintelligence.com/product/dell/latitude_7200_2_in_1) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 7200 2 in 1 Firmware](https://www.precursorintelligence.com/product/dell/latitude_7200_2_in_1_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.10.1 - [Latitude 7210 2 in 1](https://www.precursorintelligence.com/product/dell/latitude_7210_2_in_1) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 7210 2 in 1 Firmware](https://www.precursorintelligence.com/product/dell/latitude_7210_2_in_1_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.5.1 - [Latitude 7220ex Rugged Extreme Tablet](https://www.precursorintelligence.com/product/dell/latitude_7220ex_rugged_extreme_tablet) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 7220ex Rugged Extreme Tablet Firmware](https://www.precursorintelligence.com/product/dell/latitude_7220ex_rugged_extreme_tablet_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.9.1 - [Latitude 7300](https://www.precursorintelligence.com/product/dell/latitude_7300) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 7300 Firmware](https://www.precursorintelligence.com/product/dell/latitude_7300_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.11.1 - [Latitude 7310](https://www.precursorintelligence.com/product/dell/latitude_7310) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 7310 Firmware](https://www.precursorintelligence.com/product/dell/latitude_7310_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.5.1 - [Latitude 7400](https://www.precursorintelligence.com/product/dell/latitude_7400) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 7400 2-in-1](https://www.precursorintelligence.com/product/dell/latitude_7400_2-in-1) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 7400 2-in-1 Firmware](https://www.precursorintelligence.com/product/dell/latitude_7400_2-in-1_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.10.0 - [Latitude 7400 Firmware](https://www.precursorintelligence.com/product/dell/latitude_7400_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.11.1 - [Latitude 7410](https://www.precursorintelligence.com/product/dell/latitude_7410) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 7410 Firmware](https://www.precursorintelligence.com/product/dell/latitude_7410_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.5.1 - [Latitude 9410](https://www.precursorintelligence.com/product/dell/latitude_9410) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 9410 Firmware](https://www.precursorintelligence.com/product/dell/latitude_9410_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.5.1 - [Latitude 9510](https://www.precursorintelligence.com/product/dell/latitude_9510) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Latitude 9510 Firmware](https://www.precursorintelligence.com/product/dell/latitude_9510_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.4.2 - [Optiplex 3080](https://www.precursorintelligence.com/product/dell/optiplex_3080) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Optiplex 3080 Firmware](https://www.precursorintelligence.com/product/dell/optiplex_3080_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.3.1 - [Optiplex 3280 Aio](https://www.precursorintelligence.com/product/dell/optiplex_3280_aio) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Optiplex 3280 Aio Firmware](https://www.precursorintelligence.com/product/dell/optiplex_3280_aio_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.3.1 - [Optiplex 5080](https://www.precursorintelligence.com/product/dell/optiplex_5080) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Optiplex 5080 Firmware](https://www.precursorintelligence.com/product/dell/optiplex_5080_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.3.1 - [Optiplex 5480 Aio](https://www.precursorintelligence.com/product/dell/optiplex_5480_aio) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Optiplex 5480 Aio Firmware](https://www.precursorintelligence.com/product/dell/optiplex_5480_aio_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.4.0 - [Optiplex 7080](https://www.precursorintelligence.com/product/dell/optiplex_7080) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Optiplex 7080 Firmware](https://www.precursorintelligence.com/product/dell/optiplex_7080_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.3.10 - [Optiplex 7480 Aio](https://www.precursorintelligence.com/product/dell/optiplex_7480_aio) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Optiplex 7480 Aio Firmware](https://www.precursorintelligence.com/product/dell/optiplex_7480_aio_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.6.2 - [Optiplex 7780 Aio](https://www.precursorintelligence.com/product/dell/optiplex_7780_aio) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Optiplex 7780 Aio Firmware](https://www.precursorintelligence.com/product/dell/optiplex_7780_aio_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.6.2 - [Precision 3440](https://www.precursorintelligence.com/product/dell/precision_3440) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Precision 3440 Firmware](https://www.precursorintelligence.com/product/dell/precision_3440_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.3.10 - [Precision 3540](https://www.precursorintelligence.com/product/dell/precision_3540) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Precision 3540 Firmware](https://www.precursorintelligence.com/product/dell/precision_3540_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.10.1 - [Precision 3541](https://www.precursorintelligence.com/product/dell/precision_3541) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Precision 3541 Firmware](https://www.precursorintelligence.com/product/dell/precision_3541_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.11.1 - [Precision 3550](https://www.precursorintelligence.com/product/dell/precision_3550) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Precision 3550 Firmware](https://www.precursorintelligence.com/product/dell/precision_3550_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.4.3 - [Precision 3551](https://www.precursorintelligence.com/product/dell/precision_3551) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Precision 3551 Firmware](https://www.precursorintelligence.com/product/dell/precision_3551_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.4.3 - [Precision 3640 Tower](https://www.precursorintelligence.com/product/dell/precision_3640_tower) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Precision 3640 Tower Firmware](https://www.precursorintelligence.com/product/dell/precision_3640_tower_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.4.3 - [Precision 5540](https://www.precursorintelligence.com/product/dell/precision_5540) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Precision 5540 Firmware](https://www.precursorintelligence.com/product/dell/precision_5540_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.9.1 - [Precision 5550](https://www.precursorintelligence.com/product/dell/precision_5550) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Precision 5550 Firmware](https://www.precursorintelligence.com/product/dell/precision_5550_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.6.1 - [Precision 5750](https://www.precursorintelligence.com/product/dell/precision_5750) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Precision 5750 Firmware](https://www.precursorintelligence.com/product/dell/precision_5750_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.6.3 - [Precision 7540](https://www.precursorintelligence.com/product/dell/precision_7540) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Precision 7540 Firmware](https://www.precursorintelligence.com/product/dell/precision_7540_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.11.2 - [Precision 7550](https://www.precursorintelligence.com/product/dell/precision_7550) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Precision 7550 Firmware](https://www.precursorintelligence.com/product/dell/precision_7550_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.6.2 - [Precision 7740](https://www.precursorintelligence.com/product/dell/precision_7740) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Precision 7740 Firmware](https://www.precursorintelligence.com/product/dell/precision_7740_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.11.2 - [Precision 7750](https://www.precursorintelligence.com/product/dell/precision_7750) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Precision 7750 Firmware](https://www.precursorintelligence.com/product/dell/precision_7750_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.6.2 - [Vostro 3401](https://www.precursorintelligence.com/product/dell/vostro_3401) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Vostro 3401 Firmware](https://www.precursorintelligence.com/product/dell/vostro_3401_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.1.0 - [Vostro 3491](https://www.precursorintelligence.com/product/dell/vostro_3491) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Vostro 3491 Firmware](https://www.precursorintelligence.com/product/dell/vostro_3491_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.12.0 - [Vostro 3501](https://www.precursorintelligence.com/product/dell/vostro_3501) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Vostro 3501 Firmware](https://www.precursorintelligence.com/product/dell/vostro_3501_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.1.0 - [Vostro 3591](https://www.precursorintelligence.com/product/dell/vostro_3591) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Vostro 3591 Firmware](https://www.precursorintelligence.com/product/dell/vostro_3591_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.12.0 - [Vostro 3681](https://www.precursorintelligence.com/product/dell/vostro_3681) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Vostro 3681 Firmware](https://www.precursorintelligence.com/product/dell/vostro_3681_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.3.1 - [Vostro 3881](https://www.precursorintelligence.com/product/dell/vostro_3881) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Vostro 3881 Firmware](https://www.precursorintelligence.com/product/dell/vostro_3881_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.3.1 - [Vostro 3888](https://www.precursorintelligence.com/product/dell/vostro_3888) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Vostro 3888 Firmware](https://www.precursorintelligence.com/product/dell/vostro_3888_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.3.1 - [Vostro 5490](https://www.precursorintelligence.com/product/dell/vostro_5490) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Vostro 5490 Firmware](https://www.precursorintelligence.com/product/dell/vostro_5490_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.12.0 - [Vostro 5590](https://www.precursorintelligence.com/product/dell/vostro_5590) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Vostro 5590 Firmware](https://www.precursorintelligence.com/product/dell/vostro_5590_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.12.0 - [Vostro 7500](https://www.precursorintelligence.com/product/dell/vostro_7500) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Vostro 7500 Firmware](https://www.precursorintelligence.com/product/dell/vostro_7500_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.5.1 - [Vostro 7590](https://www.precursorintelligence.com/product/dell/vostro_7590) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Vostro 7590 Firmware](https://www.precursorintelligence.com/product/dell/vostro_7590_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.8.0 - [Wyse 5470](https://www.precursorintelligence.com/product/dell/wyse_5470) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Wyse 5470 Firmware](https://www.precursorintelligence.com/product/dell/wyse_5470_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.6.0 - [Xps 13 9300](https://www.precursorintelligence.com/product/dell/xps_13_9300) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Xps 13 9300 Firmware](https://www.precursorintelligence.com/product/dell/xps_13_9300_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.4.1 - [Xps 13 9380](https://www.precursorintelligence.com/product/dell/xps_13_9380) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Xps 13 9380 Firmware](https://www.precursorintelligence.com/product/dell/xps_13_9380_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.12.0 - [Xps 17 9700](https://www.precursorintelligence.com/product/dell/xps_17_9700) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Xps 17 9700 Firmware](https://www.precursorintelligence.com/product/dell/xps_17_9700_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.6.3 - [Xps 7380](https://www.precursorintelligence.com/product/dell/xps_7380) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Xps 7380 Firmware](https://www.precursorintelligence.com/product/dell/xps_7380_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.7.0 - [Xps 7390 2-in-1](https://www.precursorintelligence.com/product/dell/xps_7390_2-in-1) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): all versions - [Xps 7390 2-in-1 Firmware](https://www.precursorintelligence.com/product/dell/xps_7390_2-in-1_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.7.1 - [Xps 7590](https://www.precursorintelligence.com/product/dell/xps_7590) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): version not specified - [Xps 7590 Firmware](https://www.precursorintelligence.com/product/dell/xps_7590_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.9.1 - [Xps 9500](https://www.precursorintelligence.com/product/dell/xps_9500) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Hardware): all versions - [Xps 9500 Firmware](https://www.precursorintelligence.com/product/dell/xps_9500_firmware) by [Dell](https://www.precursorintelligence.com/vendors/dell) (Operating system): before 1.6.1 ## How do I fix CVE-2021-36283? 1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? Precursor Intelligence can work it out from your public website, or you can pick it from a list. 2. **Apply the vendor’s fix.** Install the update named in the vendor’s advisory. We’ve put the advisory first in the list. 3. **If you can’t patch today.** Follow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in. 4. **Keep an eye on it.** Track the product and we tell you as soon as we spot this flaw on the list of exploited flaws, or a jump in its exploit likelihood. ### References - [dell.com](https://www.dell.com/support/kbdoc/000191495/) (Patch, Vendor advisory) ## Questions ### What is CVE-2021-36283? CVE-2021-36283 is a medium-severity flaw in Chengming 3990 Firmware from Dell, published on 28 September 2021. An attacker has to be already on the device with an administrator account, and nobody has to click anything. If it works, the attacker can read data, change data and take it offline. ### How serious is CVE-2021-36283? It scores 6.7 out of 10 on the CVSS severity scale, which is medium. Our risk score for CVE-2021-36283 is 45 out of 100, which is Medium. Its action is "Plan remediation". No sign of exploitation and a low forecast. Patch it in your normal update cycle. ### Is CVE-2021-36283 being exploited? It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 0.2%. That can change at any time, which is why we keep watching. ### Which versions does CVE-2021-36283 affect? For Chengming 3990 Firmware from Dell: before 1.3.1. The record lists 170 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2021-36283? Install the update the vendor names in its advisory, linked first under "How do I fix" on this page. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet. ## Does CVE-2021-36283 affect you? Precursor Intelligence keeps checking for you: - **Tell us what you run.** Pick your software from a list, or let us work it out from your website. - **We match it to every flaw.** Over 400,000 published flaws, checked against your list. - **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it. - **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools. Start free (no card, nothing to install): https://www.precursorintelligence.com/register Book a demo: https://www.precursorintelligence.com/contact