Buffer overflow in Cisco Identity Services Engine Software
CVE-2026-20352
A vulnerability in the RADIUS feature of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of certain RADIUS requests. An attacker could exploit this vulnerability by sending a crafted RADIUS request directly to an affected device. A successful exploit could allow the attacker to cause the ISE node to become unavailable. For single node deployments in that condition, endpoints that have not already authenticated would be unable to access the network until the node comes back up on its own.
Vulnerability class: Buffer Overflow
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.
Affected products
- Cisco Identity Services Engine Software — versions 3.2 Patch 10, 3.2 Patch 8, 3.2 Patch 9
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20352?
- CVE-2026-20352 is a high-severity vulnerability in Cisco Identity Services Engine Software, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.6/10. Published 2026-09-16.
- How severe is CVE-2026-20352?
- High severity. CVSS v3 base score is 8.6 out of 10.