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Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software SSL/TLS Certificate Denial of Service Vulnerability

cisco-sa-asaftd-ssltls-dos-eHw76vZe · High · Published · Updated

A vulnerability in the certificate processing of 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 improper parsing of SSL/TLS certificates. An attacker could exploit this vulnerability by sending crafted DNS packets that match a static Network Address Translation (NAT) rule with DNS inspection enabled through an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ssltls-dos-eHw76vZe This advisory is part of the August 2025 release of the Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: August 2025 Semiannual Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software Security Advisory Bundled Publication.

Cisco advisory · CSAF JSON

Workarounds

There are no workarounds that address this vulnerability.

CVEsCVE-2025-20134
Cisco Bug IDsCSCwk44159
CVSS ScoreBase 8.6
Base 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
Product Names From Source
Cisco Adaptive Security Appliance (ASA) Software 9.12.4.39, Cisco Adaptive Security Appliance (ASA) Software 9.12.4.40, Cisco Adaptive Security Appliance (ASA) Software 9.12.4.41, Cisco Adaptive Security Appliance (ASA) Software 9.12.4.47, Cisco Adaptive Security Appliance (ASA) Software 9.12.4.48, Cisco Adaptive Security Appliance (ASA) Software 9.12.4.50, Cisco Adaptive Security Appliance (ASA) Software 9.12.4.52, Cisco Adaptive Security Appliance (ASA) Software 9.12.4.54, Cisco Adaptive Security Appliance (ASA) Software 9.12.4.55, Cisco Adaptive Security Appliance (ASA) Software 9.12.4.56, Cisco Adaptive Security Appliance (ASA) Software 9.12.4.58, Cisco Adaptive Security Appliance (ASA) Software 9.12.4.62, Cisco Adaptive Security Appliance (ASA) Software 9.12.4.65, Cisco Adaptive Security Appliance (ASA) Software 9.12.4.67, Cisco Adaptive Security Appliance (ASA) Software 9.14.4.6, Cisco Adaptive Security Appliance (ASA) Software 9.14.4.7, Cisco Adaptive Security Appliance (ASA) Software 9.14.4.12, Cisco Adaptive Security Appliance (ASA) Software 9.14.4.13, Cisco Adaptive Security Appliance (ASA) Software 9.14.4.14, Cisco Adaptive Security Appliance (ASA) Software 9.14.4.15, Cisco Adaptive Security Appliance (ASA) Software 9.14.4.17, Cisco Adaptive Security Appliance (ASA) Software 9.14.4.22, Cisco Adaptive Security Appliance (ASA) Software 9.14.4.23, Cisco Adaptive Security Appliance (ASA) Software 9.14.4.24, Cisco Firepower Threat Defense Software 6.6.5.2, Cisco Firepower Threat Defense Software 6.6.7, Cisco Firepower Threat Defense Software 6.6.7.1, Cisco Firepower Threat Defense Software 6.6.7.2, Cisco Firepower Threat Defense Software 6.4.0.15, Cisco Firepower Threat Defense Software 6.4.0.16, Cisco Firepower Threat Defense Software 6.4.0.17, Cisco Firepower Threat Defense Software 6.4.0.18, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Secure Firewall Threat Defense (FTD) Software, Cisco Firepower 2100 Series, Cisco Firepower 1000 Series, Cisco ASA 5500-X Series Firewalls, Cisco 3000 Series Industrial Security Appliances (ISA), Cisco Firepower 9000 Series, Cisco Firepower 4100 Series, Cisco Adaptive Security Virtual Appliance (ASAv), Cisco Secure Firewall Threat Defense Virtual

Related Products

Product CVE Evidence
Cisco Secure Firewall Threat Defense Virtual CVE-2025-20134 Cisco OpenVuln
Cisco Secure Firewall Threat Defense (FTD) Software CVE-2025-20134 Cisco OpenVuln
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software CVE-2025-20134 Cisco OpenVuln
Cisco Firepower Threat Defense Software CVE-2025-20134 Cisco OpenVuln
Cisco Firepower 9000 Series CVE-2025-20134 Cisco OpenVuln
Cisco Firepower 4100 Series CVE-2025-20134 Cisco OpenVuln
Cisco Firepower 2100 Series CVE-2025-20134 Cisco OpenVuln
Cisco Firepower 1000 Series CVE-2025-20134 Cisco OpenVuln
Cisco Adaptive Security Virtual Appliance (ASAv) CVE-2025-20134 Cisco OpenVuln
Cisco Adaptive Security Appliance (ASA) Software CVE-2025-20134 Cisco OpenVuln
Cisco ASA 5500-X Series Firewalls CVE-2025-20134 Cisco OpenVuln
Cisco 3000 Series Industrial Security Appliances (ISA) CVE-2025-20134 Cisco OpenVuln