7.5

CVE-2021-28510: arista networks eos Uncontrolled Resource Consumption

CVSS: 7.5v3.1HighModified
Published 24-01-2023Last modified 01-04-2025
Open JSON

Vulnerability summary

CVE-2021-28510 is a high (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in arista networks eos. EPSS estimates a 1.00% chance of exploitation in the next 30 days, higher than 62.2% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
1.00%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 24-01-2023
    PublishedVulnerability first disclosed.
  2. 01-04-2025
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

1.00%

Chance of exploitation in the next 30 days

Percentile

62%

Versus all other CVEs

30-day change

0.00 pp

From 1.00% on 18-09-2026

18-09-202618-10-2026
EPSS score
1.00%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (arista.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Arista1 product
  • eos< 4.23.10 | ≥ 4.24.0, < 4.24.8 | ≥ 4.25.0, < 4.25.6 | ≥ 4.26.0, < 4.26.4 | ≥ 4.27.0, < 4.27.1
Arista networks1 product
  • eos4.22 | ≥ 4.27.1, ≤ 4.27.0 | ≥ 4.26.4, ≤ 4.26.0 | ≥ 4.25.6, ≤ 4.25.0 | ≥ 4.24.8, ≤ 4.24.0 | ≥ 4.23.10, ≤ 4.23.0

2 vendors · 2 products

References

1 links