CVE-2021-28510

highpriority · track · 30EPSS 0.010 · 63 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.00% (63rd) EPSS

CVSS 7.5 · high

Is it mine?

11 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

For certain systems running EOS, a Precision Time Protocol (PTP) packet of a management/signaling message with an invalid Type-Length-Value (TLV) causes the PTP agent to restart. Repeated restarts of the service will make the service unavailable.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.3–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · ENISA EU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · psirt@arista.comexploitability 3.9 · impact 1.4

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-1284USprimaryCWE-400US

affected products (11)

Products and version ranges known to be affected.

Arista Networks EOS≤ 4.22enisa_euvdEU
Arista Networks EOS≤ 4.23.10 ≤4.23.0enisa_euvdEU
Arista Networks EOS≤ 4.24.8 ≤4.24.0enisa_euvdEU
Arista Networks EOS≤ 4.26.4 ≤4.26.0enisa_euvdEU
Arista Networks EOS≤ 4.27.1 ≤4.27.0enisa_euvdEU
Arista Networks EOS≤ 4.25.6 ≤4.25.0enisa_euvdEU
arista eos< 4.23.10nvdUScpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*
arista eos4.24.0 → 4.24.8nvdUScpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*
arista eos4.25.0 → 4.25.6nvdUScpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*
arista eos4.26.0 → 4.26.4nvdUScpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*
arista eos4.27.0 → 4.27.1nvdUScpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2023-01-26modified 2026-06-17

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+503 more

references (4)

External citations — patches, advisories, analysis.

scry

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