8.9

CVE-2026-73455: arista networks eos

CVSS: 8.9v4.0HighAwaiting analysis
Published 16-09-2026Last modified 16-09-2026
Open JSON

Vulnerability summary

CVE-2026-73455 is a high (CVSS 8.9) vulnerability in arista networks eos. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 41.6% of scored vulnerabilities.

Overall risk
36/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.9/10
010
High · v4.0 (CVE.org)
EPSS score
0.50%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 16-09-2026
    PublishedVulnerability first disclosed.
  2. 16-09-2026
    Last modifiedVulnerability information updated.

Description

On affected platforms running Arista EOS with Open Shortest Path First version 3 (OSPFv3) configured, a specially crafted packet can cause the OSPFv3 agent to restart unexpectedly.

CVSS metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

0.50%

Chance of exploitation in the next 30 days

Percentile

42%

Versus all other CVEs

30-day change

+0.02 pp

From 0.48% on 22-09-2026

22-09-202622-10-2026
EPSS score
0.50%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Arista networks1 product
  • eos≥ 1.0.0, < 4.33.0F | ≥ 4.33.0F, ≤ 4.33.8M | ≥ 4.34.0F, ≤ 4.34.6M | ≥ 4.35.0F, ≤ 4.35.4M | ≥ 4.36.0F, ≤ 4.36.0.1F

1 vendor · 1 product

References

1 links