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CISCO WARNS OF ACTIVE VPN EXPLOIT CRASHING FIREWALLS

SECURITY DESK1 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

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