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CVE-2026-76420 affects the Apache JServ Protocol (AJP) connector in Cisco Secure Firewall Management Center (FMC) Software. Incorrect initialization of connector encryption parameters at boot allows an unauthenticated remote attacker to impersonate a peer device by sending crafted packets. Successful exploitation can enable root command execution and full control of FMC REST APIs. Exploitation is possible only when the valid sftunnel connection between FMC and Cisco Secure Firewall Threat Defense (FTD) Software is down.
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Unauthenticated AJP peer-impersonation vulnerability in Cisco FMC that can lead to root command execution when sftunnel is unavailable.
An unauthenticated remote vulnerability in the AJP connector of Cisco Secure FMC Software caused by incorrect boot-time initialization of encryption parameters. Under the condition that the legitimate FMC–FTD sftunnel connection is down, an attacker can impersonate a peer device, execute commands as root, and take full control of the FMC REST APIs.
A critical unauthenticated remote command-execution vulnerability in the Apache JServ Protocol (AJP) connector of Cisco Secure FMC Software. Incorrect boot-time initialization of AJP encryption parameters can permit peer-device impersonation; crafted AJP packets may enable root command execution and full control of FMC REST APIs. Exploitation requires the valid sftunnel connection between Cisco Secure FMC and Cisco Secure FTD Software to be down.
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