Buffer overflow in Cisco Identity Services Engine (ISE) - CVE-2026-20352
Published: September 17, 2026
Vulnerability identifier: #VU150723
CSH Severity: High
CVSS v4: 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]
CVE-ID: CVE-2026-20352
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Cisco Identity Services Engine (ISE)
How to mitigate CVE-2026-20352
Install security update from vendor's website.
Cisco Identity Services Engine (ISE) - addressed in versions 3.2 Patch 11, 3.3 Patch 12, 3.4 Patch 7, 3.5 Patch 4