SB20260917242 - Denial of service in Cisco Identity Services Engine RADIUS feature
Published: September 17, 2026
Security Bulletin ID
SB20260917242
CSH Severity
High
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) Buffer overflow (CVE-ID: CVE-2026-20352)
CWE-ID: CWE-119 - Memory corruption
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 handling of certain RADIUS requests in the RADIUS feature of Cisco Identity Services Engine when processing RADIUS requests. A remote attacker can send a crafted RADIUS request directly to an affected device to cause a denial of service.
RADIUS services are enabled by default.
Remediation
Install update from vendor's website.