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Cisco Secure Firewall Vulnerability Exposes Systems to Remote Code Execution by Attackers

Cisco has issued critical security updates addressing a maximum-severity vulnerability in its Secure Firewall Management Center (FMC) Software. Tracked as CVE-2026-20131, this flaw has a CVSS base score of 10.0, allowing unauthenticated remote attackers…

HBy Heather LyonsMar 26, 20261 min read

Cisco has issued critical security updates addressing a maximum-severity vulnerability in its Secure Firewall Management Center (FMC) Software. Tracked as CVE-2026-20131, this flaw has a CVSS base score of 10.0, allowing unauthenticated remote attackers to execute arbitrary code. This vulnerability is actively exploited as of March 2026.

Vulnerability Details and Attack Vectors

The vulnerability, identified as CWE-502, is found in the web-based management interface of Cisco Secure FMC Software. It arises from the insecure deserialization of a user-supplied Java byte stream. An attacker can exploit this by sending a specially crafted serialized Java object to the management interface, requiring no authentication or user interaction.

Successful exploitation allows an attacker to execute arbitrary Java code on the operating system with root-level privileges, granting full control over the compromised firewall management system. The flaw was discovered by Keane O'Kelley from the Cisco Advanced Security Initiatives Group during internal testing. Exposure to the public internet increases the risk, so isolated management networks are recommended.

Cisco has issued critical security updates addressing a maximum-severity vulnerability in its Secure Firewall Management Center (FMC) Software.
Heather Lyons · Thehackingpost

This issue affects on-premises Cisco Secure FMC Software and the SaaS-based Cisco Security Cloud Control (SCC) Firewall Management platforms. All configurations running vulnerable software versions are impacted. However, Secure Firewall Adaptive Security Appliance (ASA) Software and Secure Firewall Threat Defense (FTD) Software are unaffected.

No workarounds or temporary mitigations are available. Cisco advises all affected organizations to upgrade to the patched software versions immediately. For SaaS-based Cisco SCC Firewall Management users, hotfixes have been deployed automatically. Administrators of on-premises FMC deployments must manually apply updates.

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Administrators should use the Cisco Software Checker to assess their exposure and identify the correct first fixed release. Customers without direct service contracts can obtain security upgrades free of charge by contacting the Cisco Technical Assistance Center.

Based on reporting by GBHackers.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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