Medium [CVE-2026-20099] Cisco FXOS and UCS Manager Software Command Injection Vulnerability
This medium-severity Cisco advisory covers CVE-2026-20099 affecting Cisco Unified Computing System (Managed), Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1.2, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1.3.
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Summary
A vulnerability in the web-based management interface of Cisco FXOS Software and Cisco UCS Manager Software could allow an authenticated, local attacker with administrative privileges to perform command injection attacks on an affected system and elevate privileges to root.
This vulnerability is due to insufficient input validation of command arguments supplied by the user. An attacker could exploit this vulnerability by authenticating to a device and submitting crafted input to the affected command.
A successful exploit could allow the attacker to execute arbitrary commands on the underlyi…
Affected products named by the advisory: Cisco Unified Computing System (Managed); Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1.2; Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1.3; Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.2.5; and 4 more.
- Scope: At the time of publication, this vulnerability affected the following Cisco products if they were running a vulnerable release of Cisco FXOS Software or UCS Manager Software:
- 4.2 and earlier — Migrate to a fixed release
- Release 4.3 (first fixed: 4.3(6c))
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- 4.3(6c)
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Upgrade to the first fixed release for your train per the Fixed Releases table in this advisory.
- Release 4.2 and earlier: migrate to a fixed release.
- Release 4.3: upgrade to 4.3(6c).
- There are no workarounds that address this vulnerability.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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