CISCO WARNS OF ACTIVE VPN EXPLOIT CRASHING FIREWALLS

SECURITY DESK■ 1 MIN READ

TUE, AUG 11, 2026

■ AI-SUMMARIZED FROM 1 SOURCE ▸ TIMELINE

Cisco has issued a warning about a high-severity denial-of-service vulnerability affecting its Secure Firewall ASA and Threat Defense (FTD) software. The flaw is being actively exploited in the wild to remotely crash affected devices.

The vulnerability allows attackers to send specially crafted VPN traffic that causes the firewall devices to crash, disrupting network operations. Cisco has not disclosed specific technical details about the flaw but confirmed active exploitation is occurring. Affected organizations using ASA or FTD software should prioritize patching. Cisco typically releases security updates through its standard advisory channels. This marks another significant threat to enterprise network infrastructure. Firewalls serve as critical security perimeters, and vulnerabilities enabling remote crashes pose substantial risk to business continuity. Organizations without patches should consider implementing network-level mitigations or monitoring for suspicious VPN traffic patterns. Cisco has advised customers to check its security advisory pages for patch availability and detailed remediation guidance.

■ SOURCES

► Bleeping Computer

■ SUMMARY WRITTEN BY AI FROM THE LINKS ABOVE

■ MORE FROM THE SECURITY DESK

P894CHROME DEPLOYS NEW DEFENSE AGAINST ACCOUNT TAKEOVERS

Google Chrome is implementing device-bound session credentials, a security feature designed to block account takeovers by tying login sessions to specific devices. The technology addresses a growing threat where attackers steal credentials to gain unauthorized access.

JUST NOW— AI Desk

P895DEADLOCK RANSOMWARE USES BLOCKCHAIN TO EVADE TAKEDOWNS

The DeadLock ransomware operation is leveraging decentralized blockchain infrastructure to protect its communications with victims and data-leak operations. The approach makes traditional law enforcement takedowns significantly more difficult.

JUST NOW— AI Desk

P890SANDWORM USES FAKE JOBS TO DISTRIBUTE TROJANIZED WIREGUARD

Russian threat group Sandworm is targeting IT professionals with trojanized WireGuard VPN clients distributed through fraudulent job offers. The campaign has been active since at least May.

1H AGO— Security Desk

P887MICROSOFT PATCHES 398 SECURITY FLAWS

Microsoft released security updates addressing 398 vulnerabilities across Windows and supported software. At least three of the flaws are already under active exploitation or have been publicly disclosed.

1H AGO— Security Desk

◄ BACK TO NEWS

CISCO WARNS OF ACTIVE VPN EXPLOIT CRASHING FIREWALLS

■ MORE FROM THE SECURITY DESK

■ SUBSCRIBE TO THE DAILY BRIEF