What’s Vulnerable › Vulnerabilities
CVE-2023-20016: Cisco FXOS Software and UCS Manager Software Configuration Backup Static Key Vulnerability
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2023-02-23 · updated 2026-06-17
- Weakness: CWE-321
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.
Affected products
- Cisco Fxos: before 2.6.1 — fixed in 2.6.1
- Cisco Ucs 6200 Firmware: all versions
- Cisco Ucs 6248Up Firmware: all versions
- Cisco Ucs 6296Up Firmware: all versions
- Cisco Ucs 6300 Firmware: all versions
- Cisco Ucs 6324 Firmware: all versions
- Cisco Ucs 6332-16Up Firmware: all versions
- Cisco Ucs 6332 Firmware: all versions
- Cisco Ucs 64108 Firmware: all versions
- Cisco Ucs 6454 Firmware: all versions
- Cisco Ucs 6536 Firmware: all versions
- Cisco Ucs Central Software: before 4.2\(3c\) — fixed in 4.2\(3c\)
How to fix
Upgrade to a fixed version: Cisco Fxos 2.6.1; Cisco Ucs Central Software 4.2\(3c\). Check the vendor advisory for mitigations.
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucsm-bkpsky-H8FCQgsA
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucsm-bkpsky-H8FCQgsA
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