CVE-2021-28503

mediumpriority · track · 39EPSS 0.007 · 54 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.73% (54th) EPSS

CVSS 6.8 · medium

Is it mine?

9 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

The impact of this vulnerability is that Arista's EOS eAPI may skip re-evaluating user credentials when certificate based authentication is used, which allows remote attackers to access the device via eAPI.

cvss

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

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 6.8–9.8

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.17.4highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:Hsecondary · ENISA EU

v3.17.4highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:Hsecondary · psirt@arista.comexploitability 2.2 · impact 5.2

v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-287USprimaryCWE-305US

affected products (9)

Products and version ranges known to be affected.

Arista Networks Arista EOSEOS-4.23 → EOS-4.23.10enisa_euvdEU
Arista Networks Arista EOSEOS-4.24 → EOS-4.24.8enisa_euvdEU
Arista Networks Arista EOSEOS-4.25 → EOS-4.25.6enisa_euvdEU
Arista Networks Arista EOSEOS-4.26 → EOS-4.26.3enisa_euvdEU
arista eos4.22 → 4.22.9mnvdUScpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*
arista eos4.23 → 4.23.9nvdUScpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*
arista eos4.24 → 4.24.7nvdUScpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*
arista eos4.25 → 4.25.5nvdUScpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*
arista eos4.26 → 4.26.2nvdUScpe: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 2022-02-04modified 2026-06-17

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+7709 more

references (4)

External citations — patches, advisories, analysis.

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