CVE-2026-121370

HIGHCVSS 8.6/10EPSS 0.51%

Last modified

CVE-2026-121370 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. On affected platforms running Arista EOS with Precision Time Protocol (PTP) configured, an unauthenticated attacker with network access to a PTP-enabled port can create a denial of service (DoS) condition by sending traffic to the system.. EPSS estimates a 0.51% chance of exploitation in the next 30 days.

Description

On affected platforms running Arista EOS with Precision Time Protocol (PTP) configured, an unauthenticated attacker with network access to a PTP-enabled port can create a denial of service (DoS) condition by sending traffic to the system.

Metrics

Weakness Enumeration

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
Arista NetworksEOS>= 4.34.0F, <= 4.34.1F; >= 4.33.0F, <= 4.33.8M; >= 4.32.0F, < 4.33.0F; >= 4.31.0F, < 4.32.0F; >= 4.30.0F, < 4.31.0F; >= 4.29.2F, < 4.30.0F

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-121370?
On affected platforms running Arista EOS with Precision Time Protocol (PTP) configured, an unauthenticated attacker with network access to a PTP-enabled port can create a denial of service (DoS) condition by sending traffic to the system.
How severe is CVE-2026-121370?
CVE-2026-121370 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 0.51% probability of exploitation in the next 30 days.
How do I fix CVE-2026-121370?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST