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CVE-2026-20181: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in Cisco Cisco Identity Services Engine Software

0
Critical
VulnerabilityCVE-2026-20181cvecve-2026-20181ciscoremoterce
Published: 08/13/2026 (08/13/2026, 05:00:00 UTC)
Source: CVE Database V5
Vendor/Project: Cisco
Product: Cisco Identity Services Engine Software

Description

CVE-2026-20181 is a critical vulnerability in Cisco Identity Services Engine (ISE) Software versions 3.1.0 through 3.5.0. It allows an authenticated attacker with administrative credentials to execute arbitrary commands on the underlying OS via crafted HTTP requests. Exploitation can lead to root privilege escalation and denial of service in single-node deployments, disrupting network access for unauthenticated endpoints until recovery.

CVSS v3.1

Score 9.1critical

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected software

Cisco

Cisco Identity Services Engine Software

Affected versions
=3.1.0=3.2.0=3.3.0=3.4.0=3.5.0

Cisco

Cisco ISE Passive Identity Connector

Affected versions
=3.2.0=3.1.0=3.3.0=3.4.0=3.5.0

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 08/13/2026, 20:46:47 UTC

Technical Analysis

This vulnerability involves improper limitation of a pathname to a restricted directory (path traversal) in Cisco Identity Services Engine Software versions 3.1.0 through 3.5.0. An authenticated remote attacker with administrative privileges can exploit insufficient validation of user-supplied input in HTTP requests to execute arbitrary commands on the underlying operating system. Successful exploitation results in privilege escalation to root and can cause denial of service in single-node deployments by disrupting network access for unauthenticated endpoints until the node is restored.

Potential Impact

An attacker with administrative credentials can execute arbitrary OS commands, escalate privileges to root, and cause denial of service in single-node deployments. This can disrupt network access for unauthenticated endpoints until the affected node is restored, impacting network availability and security.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Until a patch is available, restrict administrative access and monitor for suspicious activity involving crafted HTTP requests.

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Technical Details

Data Version
5.2
Assigner Short Name
cisco
Date Reserved
2025-10-08T11:59:15.393Z
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6a32cb1b9f87a2db09260e35

Added to database: 06/17/2026, 16:28:11 UTC

Last enriched: 08/13/2026, 20:46:47 UTC

Last updated: 09/15/2026, 10:01:30 UTC

Views: 164

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