CWE-20 Improper Input Validation in Cisco ISE/ISE-PIC
CVE-2026-20237 Published on September 16, 2026
Cisco Identity Services Engine Hardening Release - Input Validation Vulnerabilities
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.
Vulnerability Analysis
CVE-2026-20237 can be exploited with network access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Products Associated with CVE-2026-20237
Want to know whenever a new CVE is published for Cisco Identity Services Engine Software? stack.watch will email you.
Affected Versions
Cisco Identity Services Engine Software:- 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.
- 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.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.