CVE-2025-20126Network attack vector

Metrics interception or manipulation via improper certificate validation

Published Jan 8, 2025 · Updated Jan 13, 2025

Improper certificate validation in Cisco ThousandEyes Endpoint Agent for macOS before 1.206.3 allows remote attackers to alter metrics traffic. The agent accepts a crafted certificate for a hosted metrics service, allowing an on-path host to masquerade as that service and monitor or change communications. Exploitation requires an on-path network position; Cisco states that affected releases are exposed regardless of device configuration.

CVSS severity4.8
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Cisco ThousandEyes Endpoint Agent for macOS before 1.206.3 allows remote attackers to alter metrics traffic. The agent accepts a crafted certificate for a hosted metrics service, allowing an on-path host to masquerade as that service and monitor or change communications. Exploitation requires an on-path network position; Cisco states that affected releases are exposed regardless of device configuration.

The record

CVE
CVE-2025-20126
Published
Jan 8, 2025
Updated
Jan 13, 2025
Vendor
ClamAV
Product
Cisco ThousandEyes Endpoint Agent
Classifications
CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.200

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco ThousandEyes Endpoint Agentversion=1.200

Published CVSS scores

4.8CiscoCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:X/RL:X/RC:X

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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