CVE-2026-73453Network attack vector

Unauthenticated code execution via crafted P4Runtime packet

Published Sep 16, 2026 · Updated Sep 16, 2026

Code injection in P4Runtime in Arista EOS 4.29.2F through 4.36.1F allows remote attackers to execute code via a crafted session packet. The P4Runtime session-initiation path processes a crafted packet as executable code, but Arista has not disclosed the affected function or operation. Exposure requires explicitly enabled P4Runtime in one of three insecure TLS, accounting, and authorization combinations, and exploitation grants full switch administration.

CVSS severity10.0
Critical
EPSS probability0.75%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in P4Runtime in Arista EOS 4.29.2F through 4.36.1F allows remote attackers to execute code via a crafted session packet. The P4Runtime session-initiation path processes a crafted packet as executable code, but Arista has not disclosed the affected function or operation. Exposure requires explicitly enabled P4Runtime in one of three insecure TLS, accounting, and authorization combinations, and exploitation grants full switch administration.

The record

CVE
CVE-2026-73453
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
Arista Networks
Product
Arista EOS
Classifications
CWE-94, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.29.2F <4.30.0F
  2. Affected versionversion=4.30.0F <4.31.0F
  3. Affected versionversion=4.31.0F <4.32.0F
  4. Affected versionversion=4.32.0F <4.33.0F
  5. Affected versionversion=4.33.0F <4.34.0F
  6. Affected versionversion=4.34.0F <=4.34.7M
  7. Affected versionversion=4.35.0F <=4.35.5M
  8. Affected versionversion=4.36.0F <=4.36.1F

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Arista Networks · Arista EOSversion=4.29.2F <4.30.0F; version=4.30.0F <4.31.0F; version=4.31.0F <4.32.0F; version=4.32.0F <4.33.0F; version=4.33.0F <4.34.0F; version=4.34.0F <=4.34.7M; version=4.35.0F <=4.35.5M; version=4.36.0F <=4.36.1F

Published CVSS scores

10.0Arista NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
9.5Arista NetworksCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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