9.2

CVE-2026-73458: arista networks eos

CVSS: 9.2v4.0CriticalAwaiting analysis
Published 15-09-2026Last modified 15-09-2026
Open JSON

Vulnerability summary

CVE-2026-73458 is a critical (CVSS 9.2) vulnerability in arista networks eos. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 33.1% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.2/10
010
Critical · v4.0 (CVE.org)
EPSS score
0.40%
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. 15-09-2026
    PublishedVulnerability first disclosed.
  2. 15-09-2026
    Last modifiedVulnerability information updated.

Description

On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various routing protocols monitor status on BFD session(s).

CVSS metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

0.40%

Chance of exploitation in the next 30 days

Percentile

33%

Versus all other CVEs

30-day change

+0.02 pp

From 0.38% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.40%

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≥ 4.36.0, ≤ 4.36.1F | ≥ 4.35.0, ≤ 4.35.5M | ≥ 4.34.0, ≤ 4.34.7M | ≥ 4.33.0, ≤ 4.33.8M

1 vendor · 1 product

References

1 links