#VU114228 Double free in Cisco Adaptive Security Appliance (ASA) and Cisco Firewall Threat Defense (FTD) - CVE-2025-20134

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Main Vulnerability Database Vulnerabilities #VU114228

#VU114228 Double free in Cisco Adaptive Security Appliance (ASA) and Cisco Firewall Threat Defense (FTD) - CVE-2025-20134

Published: August 19, 2025


Vulnerability identifier: #VU114228
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-20134
CWE-ID: CWE-415
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Cisco Adaptive Security Appliance (ASA)
Cisco Firewall Threat Defense (FTD)
Software vendor:
Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error when parsing SSL/TLS certificates. A remote attacker can send specially crafted DNS packets that match a static Network Address Translation (NAT) rule with DNS inspection enabled through an affected device, trigger a double free error and perform a denial of service (DoS) attack.


Remediation

Install update from vendor's website.

External links