CVE intelligenceCISA KEVRansomware use

CVE-2026-20316

Cisco Secure Firewall Management Center Use of Hard-coded Password Vulnerability

Published Jul 29, 2026Sources checked Oct 28, 2026

5.3MEDIUMCVSS out of 10

What this means

Actively exploited

CISA lists CVE-2026-20316 in its Known Exploited Vulnerabilities catalog, which means exploitation has been observed. The entry applies to Cisco Secure Firewall Management Center (FMC).

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 evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Public exploit: Not collected.

Cisco Security Advisories: Exploitation reported by Cisco Security Advisories (2026-09-16)
In July 2026, the Cisco PSIRT became aware of active exploitation of this vulnerability.

What to do next

Remediation and response

Review the linked vendor advisory and apply the mitigation or fixed release for your affected product.

Cisco Security Advisories guidance

Vendor revision: Sep 16, 2026

Cisco has released software updates that address this vulnerability.

CISA KEVListedObserved exploitation

EPSS35.1%Estimated 30-day exploitation probability

Ransomware useReported by CISACISA KEV ransomware field

Threat actors2Source-linked actor relationships

Overview

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.

Source: NVD

Reported activity: In July 2026, the Cisco PSIRT became aware of active exploitation of this vulnerability.
Cisco Security Advisories · Published Sep 16, 2026

CISA says: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 evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.CISA catalog due date Aug 1, 2026