01 Record

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.

MediumPUBLISHEDCNA: Arista

CNA base score5.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:N

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02 Description

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 0.66% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 51.4% of scored records. A rank, not a probability.
NVD base score: 7.1 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
NVD analysis status: Modified. NVD last modified this record on 2026-06-17.
Red Hat severity: No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2022-01-14 19:04Z4 YR AGO

Last updated

2024-09-17 04:20Z2 YR AGO

Reserved

2021-03-16

Assigning CNA

Arista

Record state

PUBLISHED

Severity

Medium (CVSS 5.5)

CNA CVSS vector

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

Weaknesses

CWE-284Improper Access ControlPillar

Data version

5.1

Document digest

7784c96aef89e935c52263a20c06e3b68cc5c50440b2574b3a506f5272da54fd

05 Affected products

VendorProductVersionsPlatforms

Arista NetworksEOS4.22.x, 4.26.2F to 4.26.0, 4.25.5.1M to 4.25.5, 4.25.4M to 4.25.4, 4.25.3 to 4.25.0, 4.24.7M to 4.24.0, 4.23.9M to 4.23.0, 4.21.x to 4.21.x—

06 References

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

07 Remediation

The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release. CVE-2021-28507 has been fixed in the following releases: 4.26.3M and later releases in the 4.26.x train 4.25.6M and later releases in the 4.25.x train 4.25.4.1M and later releases in the 4.25.4.x train 4.24.8M and later releases in the 4.24.x train 4.23.10M and later releases in the 4.23.x train