Vulnerability in Cisco Identity Services Engine Software
CVE-2025-20343
A vulnerability in the RADIUS setting Reject RADIUS requests from clients with repeated failures on Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to cause Cisco ISE to restart unexpectedly. This vu…
EPSS: 0.005 (68.3th percentile) — read the EPSS interpretation.
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 3.4.0, 3.4 Patch 1, 3.4 Patch 2
Weakness classification (CWE)
Public proof-of-concept exploits
References
Frequently asked questions
- What is CVE-2025-20343?
- CVE-2025-20343 is a high-severity vulnerability in Cisco Identity Services Engine Software, classified under Incorrect Comparison. CVSS score: 8.6/10. Published 2025-11-05.
- How severe is CVE-2025-20343?
- High severity. CVSS v3 base score is 8.6 out of 10.
- Is CVE-2025-20343 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.