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EPSS 0.4%top 64%

CVE-2026-20199: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') in Cisco Cisco ThousandEyes Enterprise Agent

0
Medium
VulnerabilityCVE-2026-20199cvecve-2026-20199
Published: 05/20/2026 (05/20/2026, 16:15:18 UTC)
Source: CVE Database V5
Vendor/Project: Cisco
Product: Cisco ThousandEyes Enterprise Agent

Description

CVE-2026-20199 is a medium severity vulnerability in the Cisco ThousandEyes Enterprise Agent's SSL certificate handling. It allows an authenticated attacker with administrative credentials to upload a crafted certificate that could lead to arbitrary command execution as the root user on the underlying operating system. The issue arises from insufficient validation of user-supplied input. There is no confirmed patch or official remediation available at this time. Exploitation requires valid administrative access, and no known exploits are reported in the wild.

CVSS v3.1

Score 4.7medium

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

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 05/27/2026, 20:57:42 UTC

Technical Analysis

This vulnerability in Cisco ThousandEyes Enterprise Agent involves improper neutralization of special elements in SSL certificate input, enabling command injection. An attacker with valid administrative credentials can upload a maliciously crafted certificate, which the system fails to properly validate, resulting in arbitrary code execution with root privileges on the host OS. The CVSS 3.1 base score is 4.7, reflecting medium severity due to the requirement for high privileges and lack of user interaction. No patch or official fix has been documented in the vendor advisory or related sources.

Potential Impact

Successful exploitation allows an authenticated attacker with administrative rights to execute arbitrary commands as root on the underlying operating system. This could lead to full system compromise, data manipulation, or disruption of service. However, exploitation requires valid administrative credentials, limiting the attack surface. There are no known exploits in the wild at this time.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict administrative access to trusted personnel only and monitor for unauthorized certificate uploads. Avoid uploading untrusted certificates to the affected device. Follow Cisco's official communications for updates on patches or mitigations.

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Technical Details

Data Version
5.2
Assigner Short Name
cisco
Date Reserved
2025-10-08T11:59:15.397Z
Cvss Version
3.1
State
PUBLISHED
Remediation Level
null

Threat ID: 6a0de26bba1db473628f2736

Added to database: 05/20/2026, 16:33:47 UTC

Last enriched: 05/27/2026, 20:57:42 UTC

Last updated: 07/31/2026, 19:22:57 UTC

Views: 99

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