Improper input validation in Cisco Identity Services Engine Software
CVE-2026-20237
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 class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (41.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Cisco Identity Services Engine Software — versions 3.1.0, 3.1.0 p1, 3.1.0 p10
- Cisco Ise Passive Identity Connector — versions 3.1.0, 3.2.0, 3.3.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20237?
- CVE-2026-20237 is a critical-severity vulnerability in Cisco Identity Services Engine Software, classified under Improper Input Validation. CVSS score: 9.1/10. Published 2026-09-16.
- How severe is CVE-2026-20237?
- Critical severity. CVSS v3 base score is 9.1 out of 10.