Cisco ThousandEyes Endpoint Agent Certificate Validation Vulnerability
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-295.
Summary
A vulnerability in certification validation routines of Cisco ThousandEyes Endpoint Agent for macOS and RoomOS could allow an unauthenticated, remote attacker to intercept or manipulate metrics information. This vulnerability exists because the affected software does not properly validate certificates for hosted metrics services. An on-path attacker could exploit this vulnerability by intercepting network traffic using a crafted certificate. A successful exploit could allow the attacker to masquerade as a trusted host and monitor or change communications between the remote metrics service and the vulnerable client.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Cisco | Cisco ThousandEyes Endpoint Agent | 1.200 | — | No fix listed | CNA |
- Cisco ThousandEyes Endpoint Agent VendorCisco Affected 1.200 Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cisco:thousandeyes_endpoint_agent:*:*:*:*:*:*:*:* | before 1.206.3 | Vulnerable | Cisco |
| cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Apple |
| cpe:2.3:a:cisco:thousandeyes_endpoint_agent:*:*:*:*:*:*:*:* | before 1.207.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:roomos:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:a:cisco:thousandeyes_endpoint_agent:*:*:*:*:*:*:*:* Versions before 1.206.3 Vulnerable ·Cisco
- cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Apple
- cpe:2.3:a:cisco:thousandeyes_endpoint_agent:*:*:*:*:*:*:*:* Versions before 1.207.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:roomos:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-20126
- 2026-10-03 Alias added: GHSA-jwc2-hj9w-9cff
References
Advisory 1
More Cisco Thousandeyes Endpoint Agent vulnerabilities
- TI-2025-14557 Cisco ThousandEyes Endpoint Agent for Windows Arbitrary File Write Vulnerability CVSS 3.1MEDIUM 5.3
Sources
- CVE-2025-20126 · CVE Program
- CVE-2025-20126 · NVD
- FIRST EPSS
- GHSA-jwc2-hj9w-9cff · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences