---
id: CVE-2026-76420
title: "A vulnerability in the internal configuration of the Apache JServ Protocol (AJP) connector for Cisco Secure FMC Software could allow an unauthenticated, remote attacker to impersonate a peer device.\r\n\r\nThis vulnerability is due to i…"
summary: "A vulnerability in the internal configuration of the Apache JServ Protocol (AJP) connector for Cisco Secure FMC Software could allow an unauthenticated, remote attacker to impersonate a peer device.\r\n\r\nThis vulnerability is due to i…"
severity: critical
cvss: 9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-285
vendor: Cisco
product: Cisco Secure Firewall Management Center (FMC)
affected:
  - secure_firewall_management_center_fmc 7.0.0
  - secure_firewall_management_center_fmc 7.0.0.1
  - secure_firewall_management_center_fmc 7.0.1
  - secure_firewall_management_center_fmc 7.0.1.1
  - secure_firewall_management_center_fmc 7.0.2
  - secure_firewall_management_center_fmc 7.2.0
  - secure_firewall_management_center_fmc 7.0.2.1
  - secure_firewall_management_center_fmc 7.0.3
  - secure_firewall_management_center_fmc 7.2.0.1
  - secure_firewall_management_center_fmc 7.0.4
  - secure_firewall_management_center_fmc 7.2.1
  - secure_firewall_management_center_fmc 7.0.5
  - secure_firewall_management_center_fmc 7.3.0
  - secure_firewall_management_center_fmc 7.2.2
  - secure_firewall_management_center_fmc 7.3.1
  - secure_firewall_management_center_fmc 7.2.3
  - secure_firewall_management_center_fmc 7.2.3.1
  - secure_firewall_management_center_fmc 7.2.4
  - secure_firewall_management_center_fmc 7.0.6
  - secure_firewall_management_center_fmc 7.2.4.1
  - secure_firewall_management_center_fmc 7.2.5
  - secure_firewall_management_center_fmc 7.3.1.1
  - secure_firewall_management_center_fmc 7.4.0
  - secure_firewall_management_center_fmc 7.0.6.1
  - secure_firewall_management_center_fmc 7.2.5.1
  - secure_firewall_management_center_fmc 7.4.1
  - secure_firewall_management_center_fmc 7.2.6
  - secure_firewall_management_center_fmc 7.4.1.1
  - secure_firewall_management_center_fmc 7.0.6.2
  - secure_firewall_management_center_fmc 7.2.7
  - secure_firewall_management_center_fmc 7.2.5.2
  - secure_firewall_management_center_fmc 7.3.1.2
  - secure_firewall_management_center_fmc 7.2.8
  - secure_firewall_management_center_fmc 7.6.0
  - secure_firewall_management_center_fmc 7.4.2
  - secure_firewall_management_center_fmc 7.2.8.1
  - secure_firewall_management_center_fmc 7.0.6.3
  - secure_firewall_management_center_fmc 7.4.2.1
  - secure_firewall_management_center_fmc 7.2.9
  - secure_firewall_management_center_fmc 7.0.7
  - secure_firewall_management_center_fmc 7.7.0
  - secure_firewall_management_center_fmc 7.4.2.2
  - secure_firewall_management_center_fmc 7.2.10
  - secure_firewall_management_center_fmc 7.6.1
  - secure_firewall_management_center_fmc 7.4.2.3
  - secure_firewall_management_center_fmc 7.0.8
  - secure_firewall_management_center_fmc 7.6.2
  - secure_firewall_management_center_fmc 7.7.10
  - secure_firewall_management_center_fmc 7.2.10.1
  - secure_firewall_management_center_fmc 7.0.8.1
published: '2026-09-16'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T12:18:26.450'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-76420'
references:
  - url: >-
      https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc2-multivulns-HXgcqRG
    label: psirt@cisco.com
  - url: 'https://software.cisco.com'
tags:
  - nvd
  - cve.org
  - csaf
  - vendor-advisory
  - cisco
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-17T03:57:15.366414Z'
ingestedAt: '2026-09-16T16:37:52.189Z'
epss: 0.00378
epssPercentile: 0.29018
---

## Overview

A vulnerability in the internal configuration of the Apache JServ Protocol (AJP) connector for Cisco Secure FMC Software could allow an unauthenticated, remote attacker to impersonate a peer device.

This vulnerability is due to incorrect initialization of encryption parameters for the AJP connector at boot time. An attacker could exploit this vulnerability by sending crafted packets to the AJP connector. A successful exploit could allow the attacker to execute commands as root and gain full control over the FMC REST APIs on the affected device.
Note: This vulnerability can be exploited only if the valid sftunnel connection between Cisco Secure FMC Software and Cisco Secure FTD Software is down.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **cisco-sa-fmc2-multivulns-HXgcqRG** · Cisco · affected: Cisco Secure Firewall Management Center (FMC) Appliances · updated 2026-09-16 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc2-multivulns-HXgcqRG)