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Attackers Exploit Critical Cisco FMC Flaw to deploy Qilin ransomware
Three threat groups are exploiting two Cisco FMC flaws to steal credentials, gain root access and deploy Qilin ransomware. Cisco Talos says three separate threat groups are exploiting two recently patched Secure Firewall Management Center (FMC) flaws. The main target is CVE-2026-20079 , a critical authentication bypass that lets unauthenticated attackers remotely bypass security controls, run scripts and potentially gain root access. Attackers also exploit CVE-2026-20316 to access sensitive data through a low-privilege account. The second flaw can be chained with other FMC vulnerabilities to increase privileges. Cisco linked the attacks to ransomware operations, including Qilin , as well as state-sponsored activity. “Talos’ analysis illustrates three clusters of post-compromise activity on FMC instances associated with state-sponsored and crimeware threat actors, as described below.”
Cisco FMC bugs exploited by nation-state and ransomware actors (CVE-2026-20079, CVE-2026-20316)
State-sponsored and financially-motivated attackers are actively exploiting CVE-2026-20079, a critical authentication bypass vulnerability in Cisco Secure Firewall Management Center (FMC), which is used for centrally managing multiple Cisco Secure Firewall devices across a network. Two FMC vulnerabilities under active attack “Cisco Talos is actively tracking the exploitation of two vulnerabilities in Cisco’s Secure Firewall Management Center (FMC) Software,” the company’s researchers confirmed on Wednesday. These are the above mentioned CVE-2026-20079 and CVE-2026-20316, which Cisco flagged … More → The post Cisco FMC bugs exploited by nation-state and ransomware actors (CVE-2026-20079, CVE-2026-20316) appeared first on Help Net Security .
Active exploitation of Cisco Secure Firewall Management Center vulnerabilities
Cisco Talos is actively tracking the exploitation of two vulnerabilities in Cisco’s Secure Firewall Management Center (FMC) Software. First, CVE-2026-20079 is an authentication bypass vulnerability in unpatched instances of Cisco’s Secure FMC Software, which allows an unauthenticated, remote attacker to bypass authentications and execute scripts on impacted devices to obtain root access to the underlying operating system. Second, CVE-2026-20316 is a vulnerability that allows a remote attacker to log in using a low-privileged account. CVE-2026-20079 is a critical vulnerability with a CVSS score of 10. 0. Customers are strongly advised to follow Cisco’s guidance provided in the security advisory and apply the security patches previously made available. CVE-2026-20316 has a CVSS score of 5.3, however it can be used with other Cisco Secure FMC vulnerabilities to elevate privileges.
ZDI-26-533: Cisco Secure Firewall Management Center login.cgi Authentication Bypass Vulnerability
This vulnerability allows remote attackers to bypass authentication on affected installations of Cisco Secure Firewall Management Center. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 9. 8. The following CVEs are assigned: CVE-2026-20316.
CISA Adds One Known Exploited Vulnerability to Catalog
CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation. • CVE-2026-20316 Cisco Secure Firewall Management Center Use of Hard-coded Password Vulnerability This type of vulnerability is a frequent attack vector for malicious cyber actors and poses significant risks to the federal enterprise. Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies.
CVE-2026-20316 - Cisco Secure Firewall Management Center Use of Hard-coded Password Vulnerability
Cisco Secure Firewall Management Center (FMC) formerly known as Firepower Management Center contains a use of hard-coded password vulnerability that 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.
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