CVE-2026-76420
Cisco Secure Firewall Management Center Software Impersonated sftunnel Connection Vulnerability
Description
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.
Weakness: CWE-285
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco Secure Firewall Management Center Check your version | Network & Security Management | cna-assigner |
Vendor-reported products (1)
- Cisco · Cisco Secure Firewall Management Center (FMC)
Vendor advisory
cisco-sa-fmc2-multivulns-HXgcqRG
Cisco Secure Firewall Management Center Software Vulnerabilities
Cisco’s rating: Critical (advisory CVSS 9.0) · Published Sep 16, 2026
Bug IDs: CSCwu12566 , CSCwu16965 , CSCwu27279
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from