#VU114759 Improper resource shutdown or release in Cisco Adaptive Security Appliance (ASA) and Cisco Firewall Threat Defense (FTD) - CVE-2025-20127
Published: September 3, 2025
Vulnerability identifier: #VU114759
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-20127
CWE-ID: CWE-404
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Cisco Adaptive Security Appliance (ASA)
Cisco Firewall Threat Defense (FTD)
Cisco Adaptive Security Appliance (ASA)
Cisco Firewall Threat Defense (FTD)
Software vendor:
Cisco Systems, Inc
Cisco Systems, Inc
Description
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to incorrect implementation of the TLS 1.3 Cipher TLS_CHACHA20_POLY1305_SHA256. A remote user can force the device to stop accepting any new SSL/TLS or VPN requests, leading to a denial of service.
Remediation
Install updates from vendor's website.