CVE-2026-20195
Cisco Identity Services Engine Observable Response Discrepancy Vulnerability
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-204 |
| Vendor | cisco |
| Product | cisco identity services engine software |
| Ecosystems | |
| Industries | NetworkingTelecommunications |
| Published | May 6, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected Versions
Cisco / Cisco Identity Services Engine Software
3.3.0 3.3 Patch 2 3.3 Patch 1 3.3 Patch 3 3.4.0 3.3 Patch 4 3.4 Patch 1 3.3 Patch 5 3.3 Patch 6 3.4 Patch 2 3.3 Patch 7 3.4 Patch 3 3.5.0 3.4 Patch 4 3.3 Patch 8 3.5 Patch 1 3.3 Patch 9 3.4 Patch 5 3.5 Patch 3 3.5 Patch 2 3.3 Patch 10