CVE-2026-20237CWE-20

CVE-2026-20237

Critical · published September 17, 2026

CVSS v3.1
9.1
EPSS
0%
Percentile
24.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00328 · 24.6th percentile
Weakness
CWE-20 · Improper Input Validation
Published
2026-09-17T00:17Z
References (1)
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-ise-XU5EwX5T · [email protected]
EPSS history
Timeline
  • 18 SEP 03:58Z
    EPSS moved — → 0%
    epss
  • 16 SEP 20:08Z
    Cisco Identity Services Engine Hardening Release - Input Validation Vulnerabilities
    cvelistv5