SB20260917253 - Denial of service in Cisco ASA and Cisco FTD EIGRP implementation
Published: September 17, 2026
Security Bulletin ID
SB20260917253
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Memory leak (CVE-ID: CVE-2026-20222)
CWE-ID: CWE-401 - Missing release of memory after effective lifetime
CVSSv4: 7.1 [CVSS:4.0/AV:A/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 the EIGRP implementation when handling EIGRP update messages. A remote attacker can send crafted EIGRP updates at a high rate to trigger a memory leak and cause a denial of service.
Only devices with EIGRP enabled are affected.
Remediation
Install update from vendor's website.