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CVE-2026-73453: arista networks eos Code Injection

CVSS: 10.0v3.1CriticalAwaiting analysis
Published 16-09-2026Last modified 17-09-2026
Open JSON

Vulnerability summary

CVE-2026-73453 is a critical (CVSS 10.0) Code Injection vulnerability in arista networks eos. EPSS estimates a 0.69% chance of exploitation in the next 30 days, higher than 52.1% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
10.0/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.69%
0%100%
Low · -0.05 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. 17-09-2026
    Last modifiedVulnerability information updated.

Description

An unauthenticated P4Runtime (Programming Protocol-Independent Packet Processors Runtime) client can achieve arbitrary code execution under certain conditions on affected platforms running Arista EOS configured with P4Runtime. P4Runtime is disabled by default in Arista EOS. By crafting a malicious packet during the initiation of a P4Runtime session, an attacker can obtain complete administrative control over the compromised switch. This issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.

CVSS metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

0.69%

Chance of exploitation in the next 30 days

Percentile

52%

Versus all other CVEs

30-day change

-0.05 pp

From 0.75% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.69%

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≥ 4.36.0F, ≤ 4.36.1F | ≥ 4.35.0F, ≤ 4.35.5M | ≥ 4.34.0F, ≤ 4.34.7M | ≥ 4.33.0F, < 4.34.0F | ≥ 4.32.0F, < 4.33.0F | ≥ 4.31.0F, < 4.32.0F | ≥ 4.30.0F, < 4.31.0F | ≥ 4.29.2F, < 4.30.0F

1 vendor · 1 product

References

1 links