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Cisco Secure Firewall Management Center Patched for Hardcoded Credential Vulnerability CVE-2026-20316 Already Exploited in the Wild

Cisco Systems has disclosed and patched a hardcoded credential vulnerability in its Cisco Secure Firewall Management Center (FMC) product that allows remote attackers to log in and access sensitive information. The flaw, tracked as CVE-2026-20316, affects the web interface and carries a CVSS v3.1 base score of 5.3, yet Cisco rated it High severity due to the risk of privilege escalation when chained with other vulnerabilities. Zero-day exploitation was observed in July 2026, prompting immediate action from both the vendor and U.S. authorities. CISA added the issue to its Known Exploited Vulnerabilities catalog on the same day and directed federal agencies to apply mitigations by August 1. The advisory highlights that the static credentials enable low-privileged access that could be leveraged for more severe attacks. Cisco released the security advisory on July 29, 2026, and urged customers to update their deployments promptly.

Security NEXTTranslated from Japanese

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Cisco Systems has confirmed and fixed a new vulnerability in its Cisco Secure Firewall Management Center (FMC) firewall management product. The company disclosed the issue in a security advisory published on July 29, 2026, noting that the flaw had already been exploited in zero-day attacks.

The vulnerability, identified as CVE-2026-20316, stems from hardcoded credentials in the web interface. Attackers with remote access can authenticate and retrieve sensitive information. Although the CVSS v3.1 base score is 5.3, Cisco assigned a High severity rating because the flaw can be combined with other vulnerabilities to achieve privilege escalation.

Exploitation activity was first observed in July 2026. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added the vulnerability to its Known Exploited Vulnerabilities (KEV) catalog on the same day and instructed federal agencies to remediate by August 1, 2026.

Cisco emphasized that the static credentials provide low-privileged access that could serve as a stepping stone for more impactful attacks when chained with additional flaws. Customers are strongly advised to apply the available patches and review their FMC deployments for signs of compromise.

CISA KEVCisco FMCCVE-2026-20316
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