By Eric Geller
Publication Date: 2026-08-12 10:50:00
Hackers could exploit a vulnerability in Cisco firewalls’ software to crash the devices, the networking giant is warning customers.
The flaw, tracked as CVE-2026-20349, “could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition,” Cisco said in a Tuesday advisory.
Devices running two Cisco operating systems, Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD), are vulnerable to CVE-2026-20349, which stems from the software’s failure to properly check for errors when processing HTTP requests. Hackers could take advantage of that failure by sending error-riddled HTTP requests to the firewalls through their remote-access connections.
Cisco released fixes for multiple versions of the ASA and FTD software and said it “strongly recommends” that customers upgrade to those versions.
The Cybersecurity…
