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CVE-2026-20237: Cisco Identity Services Engine Hardening Release - Input Validation Vulnerabilities

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-09-18
• Weakness: CWE-20

Description

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.

Affected products

• Cisco ISE Passive Identity Connector: 3.2.0, 3.1.0, 3.3.0, 3.4.0, 3.5.0
• Cisco Identity Services Engine: 3.1.0, 3.1.0 p1, 3.1.0 p3, 3.1.0 p2, 3.2.0, 3.1.0 p4 (+41)

In the news

• Cisco Advance Notification for Publication of September 16, 2026, Security Advisories

References

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-ise-XU5EwX5T

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