# What is CVE-2020-8336? > CVE-2020-8336 is a medium-severity flaw (CVSS 6.8) in Thinkpad E14 Firmware from Lenovo, published on 9 June 2020. 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 0.3%. If you run an affected version, plan in the vendor’s fix. Canonical page: https://www.precursorintelligence.com/what-is/cve-2020-8336 ## 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:** 21 out of 100 (Low); action: Monitor. Kept up to date as the evidence changes. - **Severity:** Medium (CVSS 6.8 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:** 0.3% (latest exploit-likelihood forecast) - **Published:** 9 June 2020 - **Record last updated:** 22 June 2020 - **Main product:** Thinkpad E14 Firmware from Lenovo - **Affected products:** 76 ## What is CVE-2020-8336? In plain terms An attacker has to be physically at the device without logging in, and nobody has to click anything. If it works, the attacker can read data, change data and take it offline. ### The official description Lenovo implemented Intel CSME Anti-rollback ARB protections on some ThinkPad models to prevent roll back of CSME Firmware in flash. ### What kind of flaw is it? - Unknown: Unknown ### How an attack on it works - Where an attacker can be: Physically at the device - How hard it is to pull off: Easy: no special conditions - Login needed first: No login needed - 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:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` ## Is CVE-2020-8336 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 0.3%. That can change at any time, which is why we keep watching. Exploit likelihood over the last 7 days: 0.3%, 0.3%, 0.3%, 0.3%, 0.3%, 0.3%, 0.3%. ### Timeline - 9 June 2020: Published - 22 June 2020: Record last updated ### How Precursor Intelligence ranks it CVE-2020-8336 scores **21 out of 100 (Low)**, with the action "Monitor". 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: smaller factor - Threat activity around it: smaller factor 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-2020-8336? The published record lists 76 products. Versions are as published: "before 2020-07-10" means every version up to, but not including, 2020-07-10. - [Thinkpad E14 Firmware](https://www.precursorintelligence.com/product/lenovo/thinkpad_e14_firmware) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before 2020-07-10 - [Thinkpad E14](https://www.precursorintelligence.com/product/lenovo/thinkpad_e14) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - [Thinkpad E15](https://www.precursorintelligence.com/product/lenovo/thinkpad_e15) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - [Thinkpad E15 Firmware](https://www.precursorintelligence.com/product/lenovo/thinkpad_e15_firmware) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before 2020-07-10 - [Thinkpad E490](https://www.precursorintelligence.com/product/lenovo/thinkpad_e490) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - [Thinkpad E490 Firmware](https://www.precursorintelligence.com/product/lenovo/thinkpad_e490_firmware) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before 2020-07-10 - [Thinkpad E490s](https://www.precursorintelligence.com/product/lenovo/thinkpad_e490s) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - [Thinkpad E490s Firmware](https://www.precursorintelligence.com/product/lenovo/thinkpad_e490s_firmware) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before 2020-07-10 - [Thinkpad E590](https://www.precursorintelligence.com/product/lenovo/thinkpad_e590) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - [Thinkpad E590 Firmware](https://www.precursorintelligence.com/product/lenovo/thinkpad_e590_firmware) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before 2020-07-10 - [Thinkpad L13 1st Gen](https://www.precursorintelligence.com/product/lenovo/thinkpad_l13_1st_gen) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - [Thinkpad L13 1st Gen Firmware](https://www.precursorintelligence.com/product/lenovo/thinkpad_l13_1st_gen_firmware) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before 2020-07-10 - [Thinkpad L1415 Gen 1](https://www.precursorintelligence.com/product/lenovo/thinkpad_l1415_gen_1) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - [Thinkpad L1415 Gen 1 Firmware](https://www.precursorintelligence.com/product/lenovo/thinkpad_l1415_gen_1_firmware) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before 2020-07-10 - [Thinkpad L390 Yoga](https://www.precursorintelligence.com/product/lenovo/thinkpad_l390_yoga) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - [Thinkpad L390 Yoga Firmware](https://www.precursorintelligence.com/product/lenovo/thinkpad_l390_yoga_firmware) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before 2020-07-10 - [Thinkpad L490](https://www.precursorintelligence.com/product/lenovo/thinkpad_l490) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - [Thinkpad L490 Firmware](https://www.precursorintelligence.com/product/lenovo/thinkpad_l490_firmware) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before 2020-07-10 - [Thinkpad L590](https://www.precursorintelligence.com/product/lenovo/thinkpad_l590) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - [Thinkpad L590 Firmware](https://www.precursorintelligence.com/product/lenovo/thinkpad_l590_firmware) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before 2020-07-10 - Thinkpad P1 (20mx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad P1 (20mx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2eet47w - Thinkpad P1 (20qx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad P1 (20qx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2oet44w - Thinkpad P43s (20rx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad P43s (20rx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2iet88w - Thinkpad P52 (20mx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad P52 (20mx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2cet51w-1.34 - Thinkpad P53 (20qx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad P53 (20qx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2net37w - Thinkpad P53s (20nx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad P53s (20nx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2iet88w - Thinkpad P72 (20mx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad P72 (20mx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2cet51w - Thinkpad P73 (20qx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad P73 (20qx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2net37w - [Thinkpad R14](https://www.precursorintelligence.com/product/lenovo/thinkpad_r14) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - [Thinkpad R14 Firmware](https://www.precursorintelligence.com/product/lenovo/thinkpad_r14_firmware) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before 2020-07-10 - [Thinkpad R490](https://www.precursorintelligence.com/product/lenovo/thinkpad_r490) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - [Thinkpad R490 Firmware](https://www.precursorintelligence.com/product/lenovo/thinkpad_r490_firmware) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before 2020-07-10 - [Thinkpad R590](https://www.precursorintelligence.com/product/lenovo/thinkpad_r590) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - [Thinkpad R590 Firmware](https://www.precursorintelligence.com/product/lenovo/thinkpad_r590_firmware) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before 2020-07-10 - [Thinkpad S2 Yoga 4th Gen](https://www.precursorintelligence.com/product/lenovo/thinkpad_s2_yoga_4th_gen) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - [Thinkpad S2 Yoga 4th Gen Firmware](https://www.precursorintelligence.com/product/lenovo/thinkpad_s2_yoga_4th_gen_firmware) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before 2020-07-10 - [Thinkpad S3](https://www.precursorintelligence.com/product/lenovo/thinkpad_s3) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - [Thinkpad S3 Firmware](https://www.precursorintelligence.com/product/lenovo/thinkpad_s3_firmware) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before 2020-07-10 - [Thinkpad S3 Gen 2](https://www.precursorintelligence.com/product/lenovo/thinkpad_s3_gen_2) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - [Thinkpad S3 Gen 2 Firmware](https://www.precursorintelligence.com/product/lenovo/thinkpad_s3_gen_2_firmware) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before 2020-07-10 - Thinkpad T490 (20nx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad T490 (20nx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2iet88w - Thinkpad T490 (20qx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad T490 (20qx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2iet88w - Thinkpad T490 (20rx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad T490 (20rx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2iet88w - Thinkpad T490s (20nx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad T490s (20nx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2jet87w - Thinkpad T590 (20nx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad T590 (20nx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2iet88w - Thinkpad X1 Carbon (20qx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad X1 Carbon (20qx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2het47w - Thinkpad X1 Carbon (20rx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad X1 Carbon (20rx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2het47w - Thinkpad X1 Extreme (20mx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad X1 Extreme (20mx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2eet47w - Thinkpad X1 Extreme (20qx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad X1 Extreme (20qx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2oet44w - Thinkpad X1 Yoga (20qx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad X1 Yoga (20qx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2het47w - Thinkpad X1 Yoga (20sx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad X1 Yoga (20sx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2het47w - Thinkpad X390 (20qx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad X390 (20qx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2jet87w - Thinkpad X390 (20sx) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - Thinkpad X390 (20sx) Firmware by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2set18w - [Thinkpad X390 Yoga](https://www.precursorintelligence.com/product/lenovo/thinkpad_x390_yoga) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Hardware): version not specified - [Thinkpad X390 Yoga Firmware](https://www.precursorintelligence.com/product/lenovo/thinkpad_x390_yoga_firmware) by [Lenovo](https://www.precursorintelligence.com/vendors/lenovo) (Operating system): before n2let74w ## How do I fix CVE-2020-8336? 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 - [support.lenovo.com](https://support.lenovo.com/us/en/product_security/LEN-30042) (Vendor advisory) ## Questions ### What is CVE-2020-8336? CVE-2020-8336 is a medium-severity flaw in Thinkpad E14 Firmware from Lenovo, published on 9 June 2020. An attacker has to be physically at the device without logging in, and nobody has to click anything. If it works, the attacker can read data, change data and take it offline. ### How serious is CVE-2020-8336? It scores 6.8 out of 10 on the CVSS severity scale, which is medium. Our risk score for CVE-2020-8336 is 21 out of 100, which is Low. Its action is "Monitor". No sign of exploitation and a low forecast. Patch it in your normal update cycle. ### Is CVE-2020-8336 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 0.3%. That can change at any time, which is why we keep watching. ### Which versions does CVE-2020-8336 affect? For Thinkpad E14 Firmware from Lenovo: before 2020-07-10. The record lists 76 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2020-8336? 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-2020-8336 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