CVE-2021-28507

Name: CVE-2021-28507
Creator: NVD / NIST
Published: 2022-01-14T20:15:10.383+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.1/10EPSS 0.67%

Last modified Jun 17, 2026

CVE-2021-28507 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. 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.. EPSS estimates a 0.67% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.1/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

EPSS Probability

0.67%

47.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-284

Affected Software

Vendor	Product	Versions
Arista	Eos	>= 4.23.0, <= 4.23.9m
Arista	Eos	>= 4.24.0, <= 4.24.7m
Arista	Eos	>= 4.25.0, <= 4.25.3
Arista	Eos	>= 4.25.4, <= 4.25.4m
Arista	Eos	>= 4.25.5, <= 4.25.5.1m
Arista	Eos	>= 4.26.0, <= 4.26.2f
Arista	Eos	4.21.0f
Arista	Eos	4.21.1f
Arista	Eos	4.21.3f
Arista	Eos	4.22.0f
Arista	Eos	4.22.1f

References

https://www.arista.com/en/support/advisories-notices/security-advisories/13449-security-advisory-0071Exploit, Mitigation, Patch, Vendor Advisory
https://www.arista.com/en/support/advisories-notices/security-advisories/13449-security-advisory-0071Exploit, Mitigation, Patch, Vendor Advisory

Timeline

Published: Jan 14, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-28507?

How severe is CVE-2021-28507?

CVE-2021-28507 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 0.67% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28507?

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.

Are you affected by CVE-2021-28507?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST