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Cisco Secure Firewall Management Center (FMC) · Vulnerability

CVSS 3.1 8.8 HIGHCheck source for fixed versionsKEV status unknown

cve-program · CVE-2026-20340

Published

A vulnerability in Cisco Secure FMC Software could allow an authenticated, remote attacker to execute arbitrary commands at the root privilege level. This vulnerability is due to unsecured deserialization of web-management user-controlled data. An attacker could exploit this vulnerability by authenticating to the device and sending a crafted HTTP payload. A successful exploit could allow the attacker to save the crafted payload and then execute it on the underlying operating system as root. To exploit this vulnerability, the attacker must have valid credentials for a user account with at least the role of Security Analyst (read-only).

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Publishers link these advisories through the identifiers shown below. A shared identifier or date alone does not tell you whether your software is affected or whether the advisories describe the same cause.

CVE-2026-20340 · CVE overview and exploitation status

cve-program · CVE-2026-20340

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ChangeIntel

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Sources read 13 Nov 05:08 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current