Medium6.0Cisco

Medium [CVE-2026-20044] Cisco Secure Firewall Management Center Software Command Injection Vulnerability

This medium-severity Cisco advisory covers CVE-2026-20044 affecting Cisco Secure Firewall Management Center (FMC) 6.4.0.1, Cisco Secure Firewall Management Center (FMC) 6.4.0.3, Cisco Secure Firewall Management Center (FMC) 6.4.0.2.

cisco-sa-fmc-cmd-inject-S9ZM4EJf Published Mar 4, 2026Updated by vendor Mar 4, 2026

CVE-2026-20044

Affected products & platforms

CiscoFirewallASA / Firepower

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Summary

A vulnerability in the lockdown mechanism of Cisco Secure Firewall Management Center (FMC) Software could allow an authenticated, local attacker to perform arbitrary commands as root. This vulnerability is due to insufficient restrictions on remediation modules while in lockdown mode.

An attacker could exploit this vulnerability by sending crafted input to the system CLI of the affected device. A successful exploit could allow the attacker to run arbitrary commands or code as root, even when the system is in lockdown mode.

To exploit this vulnerability, the attacker must have valid administ…

Affected products named by the advisory: Cisco Secure Firewall Management Center (FMC) 6.4.0.1; Cisco Secure Firewall Management Center (FMC) 6.4.0.3; Cisco Secure Firewall Management Center (FMC) 6.4.0.2; Cisco Secure Firewall Management Center (FMC) 6.4.0.4; and 5 more.

Affected versions

Scope: At the time of publication, this vulnerability affected Cisco Secure FMC Software if lockdown mode was enabled. Lockdown mode is disabled by default.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Workaround status

There are no workarounds that address this vulnerability.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Cisco Security Advisories (PSIRT)official
Official vendor feed — the source of truth for this advisory. VulniPulse polled this feed and parsed this entry from it. Discovered from the machine-readable feed https://sec.cloudapps.cisco.com/security/center/psirtrss20/CiscoSecurityAdvisory.xml; this link opens the Cisco advisory index instead of the raw feed document.
Cisco
Vendor advisory pageofficial
Advisory page fetched and parsed to extract affected/fixed versions and mitigation guidance beyond what the feed carries.
Cisco

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-20044NVD CVE.org MITRE

Official resources

Cisco ASA upgrade guide
Official documentation
Official upgrade documentation for Cisco ASA (Adaptive Security Appliance) software.
Cisco Secure Firewall Threat Defense (FTD) upgrade guide
Official documentation
Official upgrade documentation for Cisco Secure Firewall Threat Defense (FTD) and FMC.
Cisco Secure Firewall compatibility & release notes
Release notes
Confirm FTD/FMC version compatibility before upgrading.
Cisco Software Checker
Official documentation
Official tool to confirm whether your exact IOS / IOS XE / NX-OS / ASA / FTD / SD-WAN release is affected and to find the first fixed release.

Discussion(0)

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