SB2025081957 - Remote denial of service in Cisco ASA and FTD
Published: August 19, 2025
Security Bulletin ID
SB2025081957
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Double free (CVE-ID: CVE-2025-20134)
CWE-ID: CWE-415 - Double Free
CVSSv4: 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
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.