CVE-2026-20316: secure firewall — Actively Exploited

Description

A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to log in to an affected device using a low-privileged account to access sensitive data within the impacted systems. This vulnerability is due to the presence of static user credentials for a low-privileged account. An attacker could exploit this vulnerability by using the account to log in to an affected system. A successful exploit could allow the attacker to log in to the affected system and access sensitive data as the low-privileged user.  Note: If the FMC management interface does not have public internet access, the attack surface that is associated with this vulnerability is reduced.   Cisco has assigned this security advisory a Security Impact Rating (SIR) of High rather than Medium as the score indicates. The reason is that this vulnerability can be used with other Cisco Secure FMC Software vulnerabilities to elevate privileges.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS — Exploit Prediction

0.0079

Probability of exploitation

0.53%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild.

Added: Jul 29, 2026 Remediation due: Aug 1, 2026

Weakness Type (CWE)

CWE-259 CWE-259

Affected Products

Vendor	Product	Versions
cisco	secure_firewall_management_center	7.0.0 — 7.0.9
cisco	secure_firewall_management_center	7.2.0 — 7.2.11
cisco	secure_firewall_management_center	7.3.0 — 7.3.1.2
cisco	secure_firewall_management_center	7.4.0 — 7.4.7
cisco	secure_firewall_management_center	7.6.0 — 7.6.5
cisco	secure_firewall_management_center	7.7.0 — 7.7.12
cisco	secure_firewall_management_center	10.0.0 — 10.0.1

References

Advisories & Patches

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-static-cred-BET3Cjh

Other References

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20316

Frequently Asked Questions

What is CVE-2026-20316? +

A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to log in to an affected device using a low-privileged account to access sensitive data within the impacted systems. This vulnerability is due to the presence of static user credentials for a low-privileged account. An attacker could exploit this vulnerability by using the account to log in to an affected system. A successful exploit could allow the attacker to log in to the affected system and access sensitive data as the low-privileged user.  Note: If the FMC management interface does not have public internet access, the attack surface that is associated with this vulnerability is reduced.   Cisco has assigned this security advisory a Security Impact Rating (SIR) of High rather than Medium as the score indicates. The reason is that this vulnerability can be used with other Cisco Secure FMC Software vulnerabilities to elevate privileges. It has a CVSS v3.1 base score of 5.3 (MEDIUM). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2026-20316? +

CVE-2026-20316 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0079, placing it in the 1th percentile for exploitation probability.

What products are affected by CVE-2026-20316? +

CVE-2026-20316 affects products from cisco, specifically: secure_firewall_management_center. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-20316? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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