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9.1

Cisco ISE could let attackers bypass input checks

CVE-2026-20237 · published 26 days ago
Summary

The Cisco Identity Services Engine and its Passive Identity Connector have flaws that do not properly verify data they receive. This could allow a malicious user to send crafted information that the system mishandles, potentially leading to unauthorized actions or service disruption. Apply the latest Cisco hardening update to fix the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
cisco cisco identity services engine software 3.1.0
cisco cisco ise passive identity connector 3.2.0
Original advisory text
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.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
9.1 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-20Improper Input Validation
Timeline
Published16 Sep 2026
Updated12 Oct 2026
First seen16 Sep 2026
Sources
CVE-2026-20237 · NVD
CVE-2026-20237 · MITRE
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