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CVE-2021-28508

TerminAttr streams IPsec sensitive data in clear text to other authorized users in CVP

Medium6.8EPSS 0.52%
Published
Updated
Reserved
Assigned by
Arista

Description

This advisory documents the impact of an internally found vulnerability in Arista EOS state streaming telemetry agent TerminAttr and OpenConfig transport protocols. The impact of this vulnerability is that, in certain conditions, TerminAttr might leak IPsec sensitive data in clear text in CVP to other authorized users, which could cause IPsec traffic to be decrypted or modified by other authorized users on the device.

Timeline

  1. ID reserved

    By Arista

  2. · 15 months later

    Published

  3. · 2 years later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2021-28508, by who scored it
Scored byCVSSScoreVector
AristaCNA (assigner)3.1Medium6.8CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
NVDNVD · Modified3.1Medium6.1CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N
EPSS (exploitation in 30 days)
0.52% · top 56% of all CVEs (7 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.8.

Weakness

Affected products

  • Arista Networks · Arista EOS

    • affected 4.23 – ≤ 4.23.11
    • affected 4.24 – ≤ 4.24.9
    • affected 4.25 – ≤ 4.25.7
    • affected 4.26 – ≤ 4.26.5
    • affected 4.27 – ≤ 4.27.3

  • Arista Networks · Arista TerminAttr

    • affected v1.10 – ≤ v1.10.10
    • affected v1.16 – ≤ v1.16.7
    • affected v1.18 – ≤ v1.18.1

What to do

Solution: The recommended resolution is to upgrade to a remediated software version at your earliest convenience. The vulnerability is fixed in the following versions: EOS versions: 4.24.10 and later release in the 4.24.x train 4.25.8 and later releases in the 4.25.x train 4.26.6 and later releases in the 4.26.x train 4.27.2 and later releases in the 4.27.x train TerminAttr versions: TerminAttr v1.10.11 and later releases in the v1.10.x train TerminAttr v1.16.8 and later releases in the v1.16.x train TerminAttr v1.19.0 and later releases

Workaround: On the affected versions, the vulnerabilities can be mitigated by disabling TerminAttr agent.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .