# What is CVE-2023-20016? > CVE-2023-20016 is a medium-severity flaw (CVSS 6.5) in Fxos from Cisco, published on 23 February 2023. 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 0.1%. If you run an affected version, plan in the vendor’s fix. Canonical page: https://www.precursorintelligence.com/what-is/cve-2023-20016 ## 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:** 26 out of 100 (Low); action: Monitor. Kept up to date as the evidence changes. - **Severity:** Medium (CVSS 6.5 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:** 0.1% (latest exploit-likelihood forecast) - **Published:** 23 February 2023 - **Record last updated:** 7 November 2023 - **Main product:** Fxos from Cisco - **Affected products:** 39 ## What is CVE-2023-20016? In plain terms An attacker has to be already on the device with an ordinary user account, and nobody has to click anything. If it works, the attacker can read data. ### The official description A vulnerability in the backup configuration feature of Cisco UCS Manager Software and in the configuration export feature of Cisco FXOS Software could allow an unauthenticated attacker with access to a backup file to decrypt sensitive information stored in the full state and configuration backup files. This vulnerability is due to a weakness in the encryption method used for the backup function. An attacker could exploit this vulnerability by leveraging a static key used for the backup configuration feature. A successful exploit could allow the attacker to decrypt sensitive information that is stored in full state and configuration backup files, such as local user credentials, authentication server passwords, Simple Network Management Protocol (SNMP) community names, and other credentials. ### What kind of flaw is it? - CWE-330: Use of Insufficiently Random Values - CWE-321: Use of Hard-coded Cryptographic Key ### 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 ordinary user account - Does someone have to click: No, nobody has to do anything - What an attacker gets: Can read data Severity vector: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N` ## Is CVE-2023-20016 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 0.1%. That can change at any time, which is why we keep watching. Exploit likelihood over the last 7 days: 0.1%, 0.1%, 0.1%, 0.1%, 0.1%, 0.1%, 0.1%. ### Timeline - 23 February 2023: Published - 7 November 2023: Record last updated ### How Precursor Intelligence ranks it CVE-2023-20016 scores **26 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-2023-20016? The published record lists 39 products. Versions are as published: "before 2.6.1" means every version up to, but not including, 2.6.1. - [Fxos](https://www.precursorintelligence.com/product/cisco/fxos) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): before 2.6.1 - [Firepower 4100](https://www.precursorintelligence.com/product/cisco/firepower_4100) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [Firepower 4110](https://www.precursorintelligence.com/product/cisco/firepower_4110) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [Firepower 4112](https://www.precursorintelligence.com/product/cisco/firepower_4112) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [Firepower 4115](https://www.precursorintelligence.com/product/cisco/firepower_4115) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [Firepower 4120](https://www.precursorintelligence.com/product/cisco/firepower_4120) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [Firepower 4125](https://www.precursorintelligence.com/product/cisco/firepower_4125) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [Firepower 4140](https://www.precursorintelligence.com/product/cisco/firepower_4140) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [Firepower 4145](https://www.precursorintelligence.com/product/cisco/firepower_4145) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [Firepower 4150](https://www.precursorintelligence.com/product/cisco/firepower_4150) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [Firepower 9300 Sm-24](https://www.precursorintelligence.com/product/cisco/firepower_9300_sm-24) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [Firepower 9300 Sm-36](https://www.precursorintelligence.com/product/cisco/firepower_9300_sm-36) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [Firepower 9300 Sm-40](https://www.precursorintelligence.com/product/cisco/firepower_9300_sm-40) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [Firepower 9300 Sm-44](https://www.precursorintelligence.com/product/cisco/firepower_9300_sm-44) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [Firepower 9300 Sm-44 X 3](https://www.precursorintelligence.com/product/cisco/firepower_9300_sm-44_x_3) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [Firepower 9300 Sm-48](https://www.precursorintelligence.com/product/cisco/firepower_9300_sm-48) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [Firepower 9300 Sm-56](https://www.precursorintelligence.com/product/cisco/firepower_9300_sm-56) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [Firepower 9300 Sm-56 X 3](https://www.precursorintelligence.com/product/cisco/firepower_9300_sm-56_x_3) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [UCS 6200](https://www.precursorintelligence.com/product/cisco/ucs_6200) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [UCS 6200 Firmware](https://www.precursorintelligence.com/product/cisco/ucs_6200_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): version not specified - [UCS 6248up](https://www.precursorintelligence.com/product/cisco/ucs_6248up) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [UCS 6248up Firmware](https://www.precursorintelligence.com/product/cisco/ucs_6248up_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): version not specified - [UCS 6296up](https://www.precursorintelligence.com/product/cisco/ucs_6296up) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [UCS 6296up Firmware](https://www.precursorintelligence.com/product/cisco/ucs_6296up_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): version not specified - [UCS 6300](https://www.precursorintelligence.com/product/cisco/ucs_6300) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [UCS 6300 Firmware](https://www.precursorintelligence.com/product/cisco/ucs_6300_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): version not specified - [UCS 6324](https://www.precursorintelligence.com/product/cisco/ucs_6324) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [UCS 6324 Firmware](https://www.precursorintelligence.com/product/cisco/ucs_6324_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): version not specified - [UCS 6332](https://www.precursorintelligence.com/product/cisco/ucs_6332) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [UCS 6332 Firmware](https://www.precursorintelligence.com/product/cisco/ucs_6332_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): version not specified - [UCS 6332-16up](https://www.precursorintelligence.com/product/cisco/ucs_6332-16up) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [UCS 6332-16up Firmware](https://www.precursorintelligence.com/product/cisco/ucs_6332-16up_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): version not specified - [UCS 64108](https://www.precursorintelligence.com/product/cisco/ucs_64108) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [UCS 64108 Firmware](https://www.precursorintelligence.com/product/cisco/ucs_64108_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): version not specified - [UCS 6454](https://www.precursorintelligence.com/product/cisco/ucs_6454) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [UCS 6454 Firmware](https://www.precursorintelligence.com/product/cisco/ucs_6454_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): version not specified - [UCS 6536](https://www.precursorintelligence.com/product/cisco/ucs_6536) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified - [UCS 6536 Firmware](https://www.precursorintelligence.com/product/cisco/ucs_6536_firmware) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): version not specified - [UCS Central Software](https://www.precursorintelligence.com/product/cisco/ucs_central_software) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): before 4.2(3c) ## How do I fix CVE-2023-20016? 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 - [sec.cloudapps.cisco.com](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucsm-bkpsky-H8FCQgsA) (Vendor advisory) ## Questions ### What is CVE-2023-20016? CVE-2023-20016 is a medium-severity flaw in Fxos from Cisco, published on 23 February 2023. An attacker has to be already on the device with an ordinary user account, and nobody has to click anything. If it works, the attacker can read data. ### How serious is CVE-2023-20016? It scores 6.5 out of 10 on the CVSS severity scale, which is medium. Our risk score for CVE-2023-20016 is 26 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-2023-20016 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 0.1%. That can change at any time, which is why we keep watching. ### Which versions does CVE-2023-20016 affect? For Fxos from Cisco: before 2.6.1. The record lists 39 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2023-20016? 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-2023-20016 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