Vulnerability in Cisco Identity Services Engine Software
CVE-2026-20195
A vulnerability in an identity management API endpoint of Cisco ISE could allow an unauthenticated, remote attacker to enumerate valid user accounts on an affected device. This vulnerability exists because error messages are observed when the affected API endpoint is called. An attacker could exploit this vulnerability by sending a series of crafted requests to the affected endpoint and analyzing the differentiated responses. A successful exploit could allow the attacker to compile a list of valid usernames on an affected system.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (17.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 17.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Cisco Identity Services Engine Software — versions 3.3.0, 3.3 Patch 2, 3.3 Patch 1
- Cisco Identity Services Engine — versions 3.3.0, 3.4.0, 3.5.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20195?
- CVE-2026-20195 is a medium-severity vulnerability in Cisco Identity Services Engine Software, classified under Observable Response Discrepancy. CVSS score: 5.3/10. Published 2026-05-06.
- How severe is CVE-2026-20195?
- Medium severity. CVSS v3 base score is 5.3 out of 10.