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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-2026-20181
Published: Wed Jun 17 2026 (06/17/2026, 16:16:56 UTC)
Source: CVE Database V5
Vendor/Project: Cisco
Product: Cisco Identity Services Engine Software

Description

A vulnerability in Cisco ISE and ISE-PIC could allow an authenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device. To exploit this vulnerability, the attacker must have valid administrative credentials. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to obtain user-level access to the underlying operating system and then elevate privileges to root. In single-node deployments, successful exploitation of this vulnerability could cause the affected ISE node to become unavailable, resulting in a denial of service (DoS) condition. In that condition, endpoints that have not already authenticated would be unable to access the network until the node is restored.

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

Affected versions
3.1.03.2.03.3.03.4.03.5.0

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 06/17/2026, 16:42:43 UTC

Technical Analysis

This vulnerability in Cisco ISE and ISE-PIC arises from insufficient validation of user-supplied input, enabling path traversal attacks. An attacker with valid administrative credentials can send crafted HTTP requests to execute arbitrary OS commands, escalate privileges to root, and potentially cause denial of service in single-node deployments by rendering the node unavailable. The CVSS 3.1 base score is 9.1, reflecting network attack vector, low attack complexity, high privileges required, no user interaction, and high impact on confidentiality, integrity, and availability. Affected versions explicitly include 3.1.0, 3.2.0, 3.3.0, 3.4.0, and 3.5.0.

Potential Impact

Successful exploitation allows an authenticated attacker to execute arbitrary commands on the underlying OS, escalate privileges to root, and potentially cause denial of service by making the ISE node unavailable. This can disrupt network access for endpoints that have not yet authenticated, impacting network availability and security.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since the vulnerability requires valid administrative credentials, ensure strict access controls and credential management. Monitor Cisco advisories for official fixes or temporary mitigations.

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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
Remediation Level
null

Threat ID: 6a32cb1b9f87a2db09260e35

Added to database: 6/17/2026, 4:28:11 PM

Last enriched: 6/17/2026, 4:42:43 PM

Last updated: 6/17/2026, 6:37:37 PM

Views: 8

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