CVE-2026-20237 PUBLISHED

Cisco Identity Services Engine Hardening Release - Input Validation Vulnerabilities

Assigner: cisco
Reserved: 08.10.2025 Published: 16.09.2026 Updated: 16.09.2026

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC), engineering teams have conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities.

The vulnerabilities tracked by CVE-2026-20237 are related to improper input validation issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-20.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS Score: 9.1

Product Status

Vendor Cisco
Product Cisco Identity Services Engine Software
Versions Default: unknown
  • Version 3.1.0 is affected
  • Version 3.1.0 p1 is affected
  • Version 3.1.0 p3 is affected
  • Version 3.1.0 p2 is affected
  • Version 3.2.0 is affected
  • Version 3.1.0 p4 is affected
  • Version 3.1.0 p5 is affected
  • Version 3.2.0 p1 is affected
  • Version 3.1.0 p6 is affected
  • Version 3.2.0 p2 is affected
  • Version 3.1.0 p7 is affected
  • Version 3.3.0 is affected
  • Version 3.2.0 p3 is affected
  • Version 3.2.0 p4 is affected
  • Version 3.1.0 p8 is affected
  • Version 3.2.0 p5 is affected
  • Version 3.2.0 p6 is affected
  • Version 3.1.0 p9 is affected
  • Version 3.3 Patch 2 is affected
  • Version 3.3 Patch 1 is affected
  • Version 3.3 Patch 3 is affected
  • Version 3.4.0 is affected
  • Version 3.2.0 p7 is affected
  • Version 3.3 Patch 4 is affected
  • Version 3.4 Patch 1 is affected
  • Version 3.1.0 p10 is affected
  • Version 3.3 Patch 5 is affected
  • Version 3.3 Patch 6 is affected
  • Version 3.4 Patch 2 is affected
  • Version 3.3 Patch 7 is affected
  • Version 3.4 Patch 3 is affected
  • Version 3.5.0 is affected
  • Version 3.4 Patch 4 is affected
  • Version 3.3 Patch 8 is affected
  • Version 3.2 Patch 8 is affected
  • Version 3.5 Patch 1 is affected
  • Version 3.3 Patch 9 is affected
  • Version 3.2 Patch 9 is affected
  • Version 3.4 Patch 5 is affected
  • Version 3.5 Patch 3 is affected
  • Version 3.5 Patch 2 is affected
  • Version 3.3 Patch 10 is affected
  • Version 3.3 Patch 11 is affected
  • Version 3.4 Patch 6 is affected
  • Version 3.2 Patch 10 is affected
  • Version 3.1.0 p72 is affected
  • Version 3.1.0 p11 is affected
Vendor Cisco
Product Cisco ISE Passive Identity Connector
Versions Default: unknown
  • Version 3.2.0 is affected
  • Version 3.1.0 is affected
  • Version 3.3.0 is affected
  • Version 3.4.0 is affected
  • Version 3.5.0 is affected

Exploits

Except as otherwise noted previously, the Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.

References

Problem Types

  • Improper Input Validation cwe