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Cisco ASA and FTD VPN flaw is being exploited to crash firewalls

Feeds.4Sysops •IT News • August 11, 2026

Cisco warns that attackers are actively exploiting CVE-2026-20349 to remotely crash Cisco Secure Firewall ASA and FTD devices through their Remote Access SSL VPN services. The unauthenticated denial-of-service flaw carries a CVSS score of 8.6, and Cisco says no workaround is available. Source

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Cisco FMC Static Credential Vulnerability Under Active Exploitation Cisco has reported a high-severity vulnerability (CVE-2026-20316) in its Secure Firewall Management Center (FMC) software, which is being actively exploited in the wild. The flaw arises from hardcoded static credentials for a low-privileged account, allowing unauthenticated remote attackers to log in and access sensitive data. Despite a CVSS score of 5.3, Cisco has assigned a High severity rating due to the potential for privilege escalation when combined with other vulnerabilities. The Cybersecurity and Infrastructure Security Agency (CISA) has added this vulnerability to its Known Exploited Vulnerabilities catalog. Cisco has released hotfixes for several affected software versions, urging immediate installation. The vulnerability affects all configurations of Cisco Secure FMC Software but does not impact Cloud-Delivered FMC or other firewall software. Administrators are advised to check logs for indicators of compromise and to contact Cisco's Technical Assistance Center for recovery assistance. The vulnerability was first disclosed on July 29, 2026. 19 sources 72

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Cisco ASA and FTD VPN flaw is being exploited to crash firewalls

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