CVE-2026-73453: CWE-94 Improper Control of Generation of Code ('Code Injection') in Arista Networks EOS
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.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-73453) involves improper control of code generation (CWE-94) in Arista EOS when configured with P4Runtime enabled. An unauthenticated P4Runtime client can send a crafted packet during session initiation to execute arbitrary code, resulting in full administrative control of the switch. P4Runtime is disabled by default, limiting attack surface. The issue affects multiple EOS versions from 4.29.2F up to and including 4.36.1F. Arista discovered the flaw internally and is not aware of any active exploitation.
Potential Impact
An attacker can gain complete administrative control over the compromised switch, leading to full confidentiality, integrity, and availability impact. This includes the ability to execute arbitrary code remotely without authentication. The vulnerability has a CVSS 3.1 base score of 10.0, indicating critical severity with network attack vector, no privileges or user interaction required, and scope change.
Mitigation Recommendations
P4Runtime is disabled by default in Arista EOS, which mitigates exposure unless explicitly enabled. No patch or official fix information is provided in the input data; therefore, patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, disabling P4Runtime if not needed is recommended to reduce risk.
CVE-2026-73453: CWE-94 Improper Control of Generation of Code ('Code Injection') in Arista Networks EOS
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 v3.1
Score 10.0critical
Affected software
Arista Networks
EOS
pkg:github/aristanetworks/eosRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-73453) involves improper control of code generation (CWE-94) in Arista EOS when configured with P4Runtime enabled. An unauthenticated P4Runtime client can send a crafted packet during session initiation to execute arbitrary code, resulting in full administrative control of the switch. P4Runtime is disabled by default, limiting attack surface. The issue affects multiple EOS versions from 4.29.2F up to and including 4.36.1F. Arista discovered the flaw internally and is not aware of any active exploitation.
Potential Impact
An attacker can gain complete administrative control over the compromised switch, leading to full confidentiality, integrity, and availability impact. This includes the ability to execute arbitrary code remotely without authentication. The vulnerability has a CVSS 3.1 base score of 10.0, indicating critical severity with network attack vector, no privileges or user interaction required, and scope change.
Mitigation Recommendations
P4Runtime is disabled by default in Arista EOS, which mitigates exposure unless explicitly enabled. No patch or official fix information is provided in the input data; therefore, patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, disabling P4Runtime if not needed is recommended to reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Arista
- Date Reserved
- 2026-08-12T16:42:47.921Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aaa692755bf5e2cf553d91c
Added to database: 09/16/2026, 10:02:15 UTC
Last enriched: 09/16/2026, 10:16:33 UTC
Last updated: 09/16/2026, 10:32:25 UTC
Views: 11
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