---
title: "CVE-2026-76420: Cisco Secure FMC Software - Command Injection"
description: "Cisco Secure FMC Software contains a command injection caused by incorrect initialization of encryption parameters in the Apache JServ Protocol (AJP) connector, letting unauthenticated remote attackers execute commands as root, exploit requires sftunnel connection to Cisco Secure FTD Software to be down."
url: https://panop.io/threat-heartbeat/CVE-2026-76420/
---

# CVE-2026-76420 Cisco Secure FMC Software - Command Injection

Cisco Secure FMC Software contains a command injection caused by incorrect initialization of encryption parameters in the Apache JServ Protocol (AJP) connector, letting unauthenticated remote attackers execute commands as root, exploit requires sftunnel connection to Cisco Secure FTD Software to be down.

CVSS base score 9.0 /10

Critical

CISA KEV

Not listed

Public exploit

None known

EPSS

0.38% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-76420)

## Details

Type

Command Injection

Impact

Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Published

16 September 2026

Updated

15 October 2026

Weakness

[CWE-285](https://cwe.mitre.org/data/definitions/285.html)

## Vendor fix

Update to the latest version of Cisco Secure FMC Software.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-76420](https://nvd.nist.gov/vuln/detail/CVE-2026-76420)
- [https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc2-multivulns-HXgcqRG](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc2-multivulns-HXgcqRG)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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