CVE-2026-20349

CVE CVE-2026-20349EUVD EUVD-2026-56643Published 2026-08-11T17:06:03.000ZLast changed 2026-08-12T04:00:28.000ZCVSS 8.6

Listed by CISA as actively exploited CISA added this vulnerability to its catalogue of known exploited vulnerabilities on 2026-08-11. That means attacks against it have been observed.

What the advisory describes

A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition.  This vulnerability is due to insufficient error checking when processing HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to the Remote Access SSL VPN service on an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Cisco — Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.22.2.9; 9.20.4.28; 9.18.4.52; 9.24.1.11; 9.16.2.3; 9.16.2.13; 9.16.4.62; 9.22.3.5; 9.16.4.82; 9.19.1; 9.16.3.15; 9.18.4.29; 9.18.4.71; 9.18.4.67; 9.18.4.5; 9.16.4.27; 9.20.4.10; 9.19.1.31; 9.18.3.39; 9.16.3.23; 9.16.3; 9.22.1.3; 9.20.3.13; 9.16.2.11; 9.18.4.50; 9.20.1; 9.18.4.24; 9.18.4.22; 9.20.4.14; 9.16.2.7; 9.20.3.4; 9.20.4.7; 9.18.4.76; 9.19.1.37; 9.22.1.1; 9.23.1.13; 9.18.2.5; 9.16.4.71; 9.20.1.5; 9.16.4.19; 9.20.4.46; 9.16.4.38; 9.18.4.57; 9.20.4.30; 9.18.4.66; 9.18.4.34; 9.16.4.89; 9.18.4.8; 9.20.4; 9.23.1.26; 9.18.4.135; 9.16.1.28; 9.18.4.82; 9.16.4.57; 9.19.1.38; 9.24.1.9; 9.20.3.7; 9.19.1.24; 9.20.3.10; 9.23.1.7; 9.18.4.53; 9.16.3.19; 9.16.3.14; 9.18.4.47; 9.19.1.22; 9.16.4.92; 9.22.1.2; 9.18.2.8; 9.23.1.32; 9.16.4.9; 9.16.2; 9.18.4; 9.18.2.7; 9.20.3.16; 9.20.3.9; 9.20.2; 9.19.1.18; 9.16.4.76; 9.19.1.12; 9.22.2.20; 9.22.2.4; 9.24.1.5; 9.18.3.56; 9.24.1.155; 9.20.2.10; 9.16.4; 9.22.2.32; 9.20.2.22; 9.16.4.67; 9.18.4.90; 9.18.3.46; 9.16.4.39; 9.16.4.42; 9.18.2; 9.20.4.34; 9.22.1.6; 9.19.1.42; 9.18.3.55; 9.18.1.3; 9.23.1.22; 9.23.1.3; 9.16.4.14; 9.20.2.21; 9.16.4.48; 9.16.2.14; 9.23.1.195; 9.22.2.14; 9.22.3; 9.20.3.20; 9.22.2; 9.18.3.53; 9.19.1.9; 9.19.1.28; 9.16.4.85; 9.16.1; 9.20.3; 9.20.4.22; 9.24.1; 9.19.1.5; 9.16.4.70; 9.18.3; 9.18.4.40; 9.18.1; 9.23.1.19; 9.16.3.3; 9.20.4.19; 9.18.4.68; 9.22.2.13; 9.16.4.61; 9.19.1.27; 9.23.1; 9.16.4.55; 9.16.4.84
Cisco — Cisco Secure Firewall Threat Defense (FTD) Software 7.2.4.1; 7.0.5; 7.7.11; 7.4.0; 7.4.1.1; 7.2.9; 7.2.10; 7.6.0; 7.3.0; 7.2.8; 7.6.1; 7.4.7; 7.3.1.2; 7.7.10.1; 7.2.3; 7.3.1; 7.2.4; 7.2.10.2; 7.4.4; 7.2.0.1; 7.0.0.1; 7.2.11; 7.0.6.3; 10.0.0; 7.2.5.2; 7.0.2; 7.3.1.1; 7.0.1.1; 7.0.4; 7.0.1; 7.4.2.1; 7.2.5; 7.4.2.3; 7.2.8.1; 7.0.8; 7.0.6.2; 7.0.8.1; 7.0.0; 7.4.2.4; 7.0.9; 7.2.12; 7.7.0; 7.6.4; 7.0.6; 7.4.1; 7.2.2; 7.2.7; 7.7.13; 7.0.7; 7.6.2; 7.2.0; 7.2.6; 7.0.6.1; 7.4.2.2; 7.6.2.1; 7.4.8; 7.0.2.1; 10.0.2; 7.2.5.1; 7.2.1; 7.4.3; 7.7.10; 7.0.3; 7.4.2

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Cisco — Secure Firewall Adaptive Security Appliance (ASA) Software
Cisco — Secure Firewall Threat Defense (FTD) Software

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