How severe is CVE-2021-28507?

CVE-2021-28507 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability none.

Is CVE-2021-28507 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28507?

CVE-2021-28507 primarily affects Arista Eos. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-28507?

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

When was CVE-2021-28507 published?

CVE-2021-28507 was published on 2022-01-14 and last updated on 2026-06-17.

CVE-2021-28507

CVE-2021-28507 is a medium-severity vulnerability in Arista Eos with a CVSS 3.x base score of 5.5. 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-284.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 4.9
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-284
Affected product: Arista Eos
Published: 2022-01-14
Last modified: 2026-06-17

Description

An issue has recently been discovered in Arista EOS where, under certain conditions, the service ACL configured for OpenConfig gNOI and OpenConfig RESTCONF might be bypassed, which results in the denied requests being forwarded to the agent.

Frequently asked questions

What is CVE-2021-28507?: An issue has recently been discovered in Arista EOS where, under certain conditions, the service ACL configured for OpenConfig gNOI and OpenConfig RESTCONF might be bypassed, which results in the denied requests being forwarded to the agent.
How severe is CVE-2021-28507?: CVE-2021-28507 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability none.
Is CVE-2021-28507 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28507?: CVE-2021-28507 primarily affects Arista Eos. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-28507?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-28507 published?: CVE-2021-28507 was published on 2022-01-14 and last updated on 2026-06-17.

References

https://www.arista.com/en/support/advisories-notices/security-advisories/13449-security-advisory-0071

Affected products (6)

cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*
cpe:2.3:o:arista:eos:4.21.0f:*:*:*:*:*:*:*
cpe:2.3:o:arista:eos:4.21.1f:*:*:*:*:*:*:*
cpe:2.3:o:arista:eos:4.21.3f:*:*:*:*:*:*:*
cpe:2.3:o:arista:eos:4.22.0f:*:*:*:*:*:*:*
cpe:2.3:o:arista:eos:4.22.1f:*:*:*:*:*:*:*

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