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Known exploited vulnerability

CVE-2026-20316

mediumCVSS 3.1 5.3In CISA KEVRansomwareEPSS 35%Published · Cisco

The short answer

CVE-2026-20316 affects Cisco Cisco Secure Firewall Management Center (FMC) and is rated medium (CVSS 5.3). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-07-29: attackers are using it, so patch it first.

What it is

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.

Weakness: CWE-259.

Severity

5.3 medium

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

Exploited (CISA KEV)

Yes, since Jul 29, 2026

Federal due date Aug 1, 2026

EPSS, next 30 days

35%

Higher than 98% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

What CISA says to do

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for…

Affected products

Cisco Secure Firewall Management Center (FMC). NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-20316 being exploited?

Yes. CISA added CVE-2026-20316 to its Known Exploited Vulnerabilities catalog on 2026-07-29, with a federal remediation due date of 2026-08-01. CISA lists it as used in ransomware campaigns.

How do I fix CVE-2026-20316?

CISA's required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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