# CVE-2024-20353 A vulnerability in the management and VPN web servers for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower 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 incomplete error checking when parsing an HTTP header. An attacker could exploit this vulnerability by sending a crafted HTTP request to a targeted web server on a device. A successful exploit could allow the attacker to cause a DoS condition when the device reloads. - Page: https://www.vulneraibility.com/cve/CVE-2024-20353 - CVSS: 8.6 - Known exploited: yes, in CISA KEV since 2024-04-24; CISA due date 2024-05-01 - EPSS: 69.82% (percentile 99.4) - CISA SSVC: exploitation active, automatable yes, technical impact partial (assessed 2024-04-29) - Weakness: CWE-835 - Published: 2024-04-24 ## Affected versions - Cisco Cisco Adaptive Security Appliance (ASA) Software: affected 9.8.1; 9.8.1.5; 9.8.1.7; 9.8.2; 9.8.2.8; 9.8.2.14; 9.8.2.15; 9.8.2.17; 9.8.2.20; 9.8.2.24; 9.8.2.26; 9.8.2.28; 9.8.2.33; 9.8.2.35; 9.8.2.38; 9.8.3.8; 9.8.3.11; 9.8.3.14; 9.8.3.16; 9.8.3.18; 9.8.3.21; 9.8.3; 9.8.3.26; 9.8.3.29; 9.8.4; 9.8.4.3; 9.8.4.7; 9.8.4.8; 9.8.4.10; 9.8.4.12; 9.8.4.15; 9.8.4.17; 9.8.4.25; 9.8.4.20; 9.8.4.22; 9.8.4.26; 9.8.4.29; 9.8.4.32; 9.8.4.33; 9.8.4.34; 9.8.4.35; 9.8.4.39; 9.8.4.40; 9.8.4.41; 9.8.4.43; 9.8.4.44; 9.8.4.45; 9.8.4.46; 9.8.4.48; 9.12.1; 9.12.1.2; 9.12.1.3; 9.12.2; 9.12.2.4; 9.12.2.5; 9.12.2.9; 9.12.3; 9.12.3.2; 9.12.3.7; 9.12.4; 9.12.3.12; 9.12.3.9; 9.12.2.1; 9.12.4.2; 9.12.4.4; 9.12.4.7; 9.12.4.10; 9.12.4.13; 9.12.4.8; 9.12.4.18; 9.12.4.24; 9.12.4.26; 9.12.4.29; 9.12.4.30; 9.12.4.35; 9.12.4.37; 9.12.4.38; 9.12.4.39; 9.12.4.40; 9.12.4.41; 9.12.4.47; 9.12.4.48; 9.12.4.50; 9.12.4.52; 9.12.4.54; 9.12.4.55; 9.12.4.56; 9.12.4.58; 9.12.4.62; 9.12.4.65; 9.14.1; 9.14.1.10; 9.14.1.6; 9.14.1.15; 9.14.1.19; 9.14.1.30; 9.14.2; 9.14.2.4; 9.14.2.8; 9.14.2.13; 9.14.2.15; 9.14.3; 9.14.3.1; 9.14.3.9; 9.14.3.11; 9.14.3.13; 9.14.3.18; 9.14.3.15; 9.14.4; 9.14.4.6; 9.14.4.7; 9.14.4.12; 9.14.4.13; 9.14.4.14; 9.14.4.15; 9.14.4.17; 9.14.4.22; 9.14.4.23; 9.15.1; 9.15.1.7; 9.15.1.10; 9.15.1.15; 9.15.1.16; 9.15.1.17; 9.15.1.1; 9.15.1.21; 9.16.1; 9.16.1.28; 9.16.2; 9.16.2.3; 9.16.2.7; 9.16.2.11; 9.16.2.13; 9.16.2.14; 9.16.3; 9.16.3.3; 9.16.3.14; 9.16.3.15; 9.16.3.19; 9.16.3.23; 9.16.4; 9.16.4.9; 9.16.4.14; 9.16.4.18; 9.16.4.19; 9.16.4.27; 9.16.4.38; 9.16.4.39; 9.16.4.42; 9.16.4.48; 9.16.4.55; 9.17.1; 9.17.1.7; 9.17.1.9; 9.17.1.10; 9.17.1.11; 9.17.1.13; 9.17.1.15; 9.17.1.20; 9.17.1.30; 9.17.1.33; 9.18.1; 9.18.1.3; 9.18.2; 9.18.2.5; 9.18.2.7; 9.18.2.8; 9.18.3; 9.18.3.39; 9.18.3.46; 9.18.3.53; 9.18.3.55; 9.18.3.56; 9.18.4; 9.18.4.5; 9.18.4.8; 9.19.1; 9.19.1.5; 9.19.1.9; 9.19.1.12; 9.19.1.18; 9.19.1.22; 9.19.1.24; 9.19.1.27; 9.20.1; 9.20.1.5; 9.20.2 - Cisco Cisco Firepower Threat Defense Software: affected 6.2.3; 6.2.3.1; 6.2.3.2; 6.2.3.3; 6.2.3.4; 6.2.3.5; 6.2.3.6; 6.2.3.7; 6.2.3.8; 6.2.3.10; 6.2.3.11; 6.2.3.9; 6.2.3.12; 6.2.3.13; 6.2.3.14; 6.2.3.15; 6.2.3.16; 6.2.3.17; 6.2.3.18; 6.6.0; 6.6.0.1; 6.6.1; 6.6.3; 6.6.4; 6.6.5; 6.6.5.1; 6.6.5.2; 6.6.7; 6.6.7.1; 6.4.0; 6.4.0.1; 6.4.0.3; 6.4.0.2; 6.4.0.4; 6.4.0.5; 6.4.0.6; 6.4.0.7; 6.4.0.8; 6.4.0.9; 6.4.0.10; 6.4.0.11; 6.4.0.12; 6.4.0.13; 6.4.0.14; 6.4.0.15; 6.4.0.16; 6.4.0.17; 6.7.0; 6.7.0.1; 6.7.0.2; 6.7.0.3; 7.0.0; 7.0.0.1; 7.0.1; 7.0.1.1; 7.0.2; 7.0.2.1; 7.0.3; 7.0.4; 7.0.5; 7.0.6; 7.0.6.1; 7.1.0; 7.1.0.1; 7.1.0.2; 7.1.0.3; 7.2.0; 7.2.0.1; 7.2.1; 7.2.2; 7.2.3; 7.2.4; 7.2.4.1; 7.2.5; 7.2.5.1; 7.3.0; 7.3.1; 7.3.1.1; 7.4.0; 7.4.1 A version outside these ranges is not a statement that it is unaffected. ## References - [other] https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-websrvs-dos-X8gNucD2 - [exploit] https://blog.talosintelligence.com/arcanedoor-new-espionage-focused-campaign-found-targeting-perimeter-network-devices/ - [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-20353 --- Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.