CVE-2026-20237: Improper Input Validation in Cisco Cisco Identity Services Engine Software
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.
AI Analysis
Technical Summary
Cisco Identity Services Engine (ISE) and ISE Passive Identity Connector (ISE-PIC) contain multiple improper input validation vulnerabilities grouped under CWE-20. These issues were discovered internally by Cisco engineering teams during a comprehensive security review. The vulnerability affects Cisco ISE Software versions 3.1.0, 3.2.0, 3.3.0, 3.4.0, and 3.5.0. The CVSS v3.1 base score is 9.1, indicating critical severity with network attack vector, low attack complexity, high privileges required, no user interaction, and impacts on confidentiality, integrity, and availability with scope changed.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker with high privileges to cause a complete compromise of the affected Cisco ISE system, impacting confidentiality, integrity, and availability. The critical CVSS score reflects the potential for severe damage to the system and network environment.
Mitigation Recommendations
Cisco has released a software hardening update addressing these vulnerabilities as part of their proactive security commitment. Users should apply the official Cisco patches or updates that fix these issues. Since this is not a cloud service, remediation requires customer action to update affected software versions. Patch status is confirmed by Cisco's internal review and release of a hardening update.
CVE-2026-20237: Improper Input Validation in Cisco Cisco Identity Services Engine Software
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.
CVSS v3.1
Score 9.1critical
Affected software
Cisco
Cisco Identity Services Engine Software
Cisco
Cisco ISE Passive Identity Connector
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Cisco Identity Services Engine (ISE) and ISE Passive Identity Connector (ISE-PIC) contain multiple improper input validation vulnerabilities grouped under CWE-20. These issues were discovered internally by Cisco engineering teams during a comprehensive security review. The vulnerability affects Cisco ISE Software versions 3.1.0, 3.2.0, 3.3.0, 3.4.0, and 3.5.0. The CVSS v3.1 base score is 9.1, indicating critical severity with network attack vector, low attack complexity, high privileges required, no user interaction, and impacts on confidentiality, integrity, and availability with scope changed.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker with high privileges to cause a complete compromise of the affected Cisco ISE system, impacting confidentiality, integrity, and availability. The critical CVSS score reflects the potential for severe damage to the system and network environment.
Mitigation Recommendations
Cisco has released a software hardening update addressing these vulnerabilities as part of their proactive security commitment. Users should apply the official Cisco patches or updates that fix these issues. Since this is not a cloud service, remediation requires customer action to update affected software versions. Patch status is confirmed by Cisco's internal review and release of a hardening update.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- cisco
- Date Reserved
- 2025-10-08T11:59:15.400Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aaaf94155bf5e2cf51b934f
Added to database: 09/16/2026, 20:17:05 UTC
Last enriched: 09/16/2026, 20:33:18 UTC
Last updated: 09/17/2026, 01:28:54 UTC
Views: 7
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