How severe is CVE-2021-28510?

CVE-2021-28510 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2021-28510 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28510?

CVE-2021-28510 affects Arista Eos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28510?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-28510 published?

CVE-2021-28510 was published on 2023-01-26 and last updated on 2026-06-17.

CVE-2021-28510

CVE-2021-28510 is a medium-severity vulnerability in Arista Eos with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1284.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1284
Affected product: Arista Eos
Published: 2023-01-26
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-28510?: 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.
How severe is CVE-2021-28510?: CVE-2021-28510 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2021-28510 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28510?: CVE-2021-28510 affects Arista Eos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28510?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-28510 published?: CVE-2021-28510 was published on 2023-01-26 and last updated on 2026-06-17.

References

https://www.arista.com/en/support/advisories-notices/security-advisory/15439-security-advisory-0076

Affected products (1)

cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*

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