SB20260917254 - Denial of service in Cisco ASA and Cisco FTD DTLS handling

Description

This security bulletin contains information about 1 vulnerability.

1) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-20250)

CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper resource management in DTLS message handling when processing certain DTLS messages. A remote attacker can send a crafted stream of DTLS traffic to cause a denial of service.

DTLS flow offload must be enabled on Cisco Secure Firewall 3100 Series or 4200 Series devices.

Remediation

Install update from vendor's website.

References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-dtls-dos-Kp57HkyO
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-dtls-dos-Kp57HkyO