CVE-2023-20016: Cisco Fxos

Medium severity, CVSS 6.5. EPSS: 0.1% chance of exploitation in the next 30 days.

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: affected versions not specified
• Cisco Ucs 6248up Firmware: affected versions not specified
• Cisco Ucs 6296up Firmware: affected versions not specified
• Cisco Ucs 6300 Firmware: affected versions not specified
• Cisco Ucs 6324 Firmware: affected versions not specified
• Cisco Ucs 6332-16up Firmware: affected versions not specified
• Cisco Ucs 6332 Firmware: affected versions not specified
• Cisco Ucs 64108 Firmware: affected versions not specified
• Cisco Ucs 6454 Firmware: affected versions not specified
• Cisco Ucs 6536 Firmware: affected versions not specified
• Cisco Ucs Central Software: before 4.2\(3c\) (fixed in 4.2\(3c\))

Published 2023-02-23. Last modified 2026-06-17.