Cisco Identity Services Engine Hardening Release - Input Validation Vulnerabilities

published 2026-09-16 53 d ago modified 2026-09-18 51 d ago also EUVD-2026-81108

cvss: 9.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits: 0; none known

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.

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 52 d ago (2026-09-18)

Exploit prediction

0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.1	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

Cisco Cisco Identity Services Engine Software
Cisco Cisco ISE Passive Identity Connector

Classification

Weakness

CWE-20 Improper Input Validation

References

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

Sources

CVE List CVE-2026-20237
NVD CVE-2026-20237

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Summary