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CVE-2026-20195

Cisco Identity Services Engine Observable Response Discrepancy Vulnerability

Published: May 6, 2026Updated: May 6, 2026 Sources: CVE List NVDCWE-204
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.3%
Top 81.0%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-204

Affected Products

Cisco Identity Services Engine SoftwareCisco
On-premSecurity Product
Networking Infrastructure
ciscocommercialUSNetworking Infrastructureaka cisco systems, cisco systems inc.

Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-unauth-bypass-uxjRXGpb
sec.cloudapps.cisco.com

Timeline

Published
May 6, 2026
Last Updated
May 6, 2026

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