CVE-2026-20195
Cisco Identity Services Engine Observable Response Discrepancy Vulnerability
At a glance Severity MEDIUM 5.3 EPSS EPSS 0.27 % · percentile 20 (2026-10-27) State PUBLISHED Published 2026-05-06 Updated 2026-05-06 Assigner cisco NVD status Analyzed Description 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.
Scores Version Score Vector Scored by CVSS 3.1 MEDIUM 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N cisco CVSS 3.1 MEDIUM 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N NVD · psirt@cisco.com (Secondary)
Weaknesses (CWE)
European references
Affected configurations (NVD CPE) cpe:2.3:a:cisco:identity_services_engine:*:*:*:*:*:*:*:* ≤ 3.2.0cpe:2.3:a:cisco:identity_services_engine:3.3.0:-:*:*:*:*:*:*cpe:2.3:a:cisco:identity_services_engine:3.3.0:patch1:*:*:*:*:*:*cpe:2.3:a:cisco:identity_services_engine:3.3.0:patch10:*:*:*:*:*:*cpe:2.3:a:cisco:identity_services_engine:3.3.0:patch2:*:*:*:*:*:*cpe:2.3:a:cisco:identity_services_engine:3.3.0:patch3:*:*:*:*:*:*cpe:2.3:a:cisco:identity_services_engine:3.3.0:patch4:*:*:*:*:*:*cpe:2.3:a:cisco:identity_services_engine:3.3.0:patch5:*:*:*:*:*:*cpe:2.3:a:cisco:identity_services_engine:3.3.0:patch6:*:*:*:*:*:*cpe:2.3:a:cisco:identity_services_engine:3.3.0:patch7:*:*:*:*:*:*cpe:2.3:a:cisco:identity_services_engine:3.3.0:patch8:*:*:*:*:*:*cpe:2.3:a:cisco:identity_services_engine:3.3.0:patch9:*:*:*:*:*:*cpe:2.3:a:cisco:identity_services_engine:3.4.0:-:*:*:*:*:*:*cpe:2.3:a:cisco:identity_services_engine:3.4.0:patch1:*:*:*:*:*:*cpe:2.3:a:cisco:identity_services_engine:3.4.0:patch2:*:*:*:*:*:*cpe:2.3:a:cisco:identity_services_engine:3.4.0:patch3:*:*:*:*:*:*cpe:2.3:a:cisco:identity_services_engine:3.4.0:patch4:*:*:*:*:*:*cpe:2.3:a:cisco:identity_services_engine:3.4.0:patch5:*:*:*:*:*:*cpe:2.3:a:cisco:identity_services_engine:3.5.0:-:*:*:*:*:*:*cpe:2.3:a:cisco:identity_services_engine:3.5.0:patch1:*:*:*:*:*:*cpe:2.3:a:cisco:identity_services_engine:3.5.0:patch2:*:*:*:*:*:*Affected products
References
Sources
