CVE-2025-20126: A vulnerability in certification validation routines of Cisco ThousandEyes Endpoint Agent for macOS and RoomOS

Q: How do I fix CVE-2025-20126?

thousandeyes endpoint agent: upgrade to 1.206.3, 1.207.2. Exact commands for each OS are on this page.

Q: Is CVE-2025-20126 being exploited?

CVE-2025-20126 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-20126 affect?

CVE-2025-20126 affects thousandeyes endpoint agent. Severity is medium (CVSS 4.8). 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 beca

Q: How urgent is CVE-2025-20126?

Priority 23/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 4.8REMOTEUPGRADE

CVE-2025-20126 is a medium-severity flaw (CVSS 4.8) affecting thousandeyes endpoint agent. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 94%)
CISA exploited list	No
Weakness	CWE-295
Published	2025-01-08
Last modified	2026-06-17

Publisher (CNA): Cisco Systems, Inc. · Vendor: cisco

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-01-08 16:15 UTCPublished CVE record published
2026-06-17 08:40 UTCUpdated Record last modified

cisco thousandeyes endpoint agent UPGRADE

Affected: < 1.206.3 · < 1.207.2

Fixed in: 1.206.3, 1.207.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy thousandeyes-endpoint-agent || rpm -q thousandeyes-endpoint-agent || thousandeyes-endpoint-agent --version

2. UPGRADE to 1.206.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade thousandeyes-endpoint-agent

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade thousandeyes-endpoint-agent

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-20126?

thousandeyes endpoint agent: upgrade to 1.206.3, 1.207.2. Exact commands for each OS are on this page.

Is CVE-2025-20126 being exploited?

CVE-2025-20126 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-20126 affect?

CVE-2025-20126 affects thousandeyes endpoint agent. Severity is medium (CVSS 4.8). 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 beca

How urgent is CVE-2025-20126?

Priority 23/100. Remotely exploitable, no login, no user action

Software pages

macOS vulnerabilities · Cisco vulnerabilities

References

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