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.

HIGH

7.5

CVSS Score

Published: January 24, 2023 at 12:00 AM UTC

Updated: June 17, 2026 at 03:46 AM UTC

78 products affected across 2 vendorsEos7500R3K-36Cq7500R3-36Cq

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Severity

HIGH7.5

Exploit prediction

EPSS 1%

SSVC

PoC

Description

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Eos · Arista

95%

v < 4.23.104.24.0 ≤ v < 4.24.84.25.0 ≤ v < 4.25.64.26.0 ≤ v < 4.26.44.27.0 ≤ v < 4.27.1

Affected range stops below 4.23.10, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.24.8, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.25.6, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.26.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.27.1, so it looks safe — our inference, not a vendor statement

arista-7020r (environment) · arista-7050cx3-32s (environment) · arista-7050cx3m-32s (environment) · arista-7050qx-32s (environment) · arista-7050qx2-32s (environment) · arista-7050sx-128 (environment) · arista-7050sx-64 (environment) · arista-7050sx-72q (environment) · arista-7050sx2-128 (environment) · arista-7050sx2-72q (environment) · arista-7050sx3-48c8 (environment) · arista-7050sx3-48yc (environment) · arista-7050sx3-48yc12 (environment) · arista-7050sx3-48yc8 (environment) · arista-7050sx3-96yc8 (environment) · arista-7050tx-48 (environment) · arista-7050tx-64 (environment) · arista-7050tx-72q (environment) · arista-7050tx2-128 (environment) · arista-7050tx3-48c8 (environment) · arista-7060cx-32s (environment) · arista-7060cx2-32s (environment) · arista-7060dx4-32 (environment) · arista-7060px4-32 (environment) · arista-7060sx2-48yc6 (environment) · arista-7150s-24 (environment) · arista-7150s-52 (environment) · arista-7150s-64 (environment) · arista-7150sc-24 (environment) · arista-7150sc-64 (environment) · arista-7170-32c (environment) · arista-7170-32cd (environment) · arista-7170-64c (environment) · arista-720xp-24y6 (environment) · arista-720xp-24zy4 (environment) · arista-720xp-48y6 (environment) · arista-720xp-48zc2 (environment) · arista-720xp-96zc2 (environment) · arista-7250qx-64 (environment) · arista-7260cx (environment) · arista-7260cx3 (environment) · arista-7260cx3-64 (environment) · arista-7260qx (environment) · arista-7280e (environment) · arista-7280r (environment) · arista-7280r2 (environment) · arista-7280r3 (environment) · arista-7280sr3-48yc8 (environment) · arista-7280sr3k-48yc8 (environment) · arista-7300x-32q (environment) · arista-7300x-64s (environment) · arista-7300x-64t (environment) · arista-7300x3-32c (environment) · arista-7300x3-48yc4 (environment) · arista-7304x3 (environment) · arista-7308x3 (environment) · arista-7320x-32c (environment) · arista-7324x (environment) · arista-7328x (environment) · arista-7368x4 (environment) · arista-7500e (environment) · arista-7500r (environment) · arista-7500r2 (environment) · arista-7500r3 (environment) · arista-7500r3-24d (environment) · arista-7500r3-24p (environment) · arista-7500r3-36cq (environment) · arista-7500r3k-36cq (environment) · arista-7504r3 (environment) · arista-7508r3 (environment) · arista-7512r3 (environment) · arista-7800r3-36p (environment) · arista-7800r3-48cq (environment) · arista-7800r3k-48cq (environment) · arista-7804r3 (environment) · arista-7808r3 (environment)

Arista EOS · Arista Networks

60%

4.23.10 ≤ v ≤ 4.23.04.24.8 ≤ v ≤ 4.24.04.25.6 ≤ v ≤ 4.25.04.26.4 ≤ v ≤ 4.26.04.27.1 ≤ v ≤ 4.27.04.22 4.23.10 4.24.8 4.25.6 4.26.4 4.27.1

7020R · Aristadevice

80%

All versions

7050Cx3-32S · Aristadevice

80%

All versions

7050Cx3M-32S · Aristadevice

80%

All versions