CVE-2026-73456: CWE-94 Improper Control of Generation of Code ('Code Injection') in Arista Networks EOS
Under certain circumstances on affected platforms running Arista EOS with gRPC Network Packet Sampling Interface (gNPSI) enabled, an unauthenticated gNPSI client can craft a malicious request to allow arbitrary code execution, granting an attacker full administrative control over the compromised switch.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-73456) in Arista EOS arises from improper control of code generation (CWE-94) when the gNPSI feature is enabled. It allows an unauthenticated gNPSI client to craft malicious requests that lead to arbitrary code execution on the device. Successful exploitation grants the attacker full administrative privileges on the compromised switch. The CVSS 3.1 base score is 10.0, reflecting network attack vector, no privileges or user interaction required, and complete confidentiality, integrity, and availability impact. Affected versions include >=4.36.0 <4.36.2F, >=4.35.0 <4.35.6M, and >=4.34.2F <4.34.8M.
Potential Impact
An attacker can remotely execute arbitrary code without authentication, resulting in full administrative control over the affected Arista EOS switch. This compromises confidentiality, integrity, and availability of the device and network traffic it handles.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until official fixes are available, disable the gNPSI feature if possible to mitigate exposure. Monitor Arista Networks advisories for patches addressing this vulnerability.
CVE-2026-73456: CWE-94 Improper Control of Generation of Code ('Code Injection') in Arista Networks EOS
Description
Under certain circumstances on affected platforms running Arista EOS with gRPC Network Packet Sampling Interface (gNPSI) enabled, an unauthenticated gNPSI client can craft a malicious request to allow arbitrary code execution, granting an attacker full administrative control over the compromised switch.
CVSS v3.1
Score 10.0critical
Affected software
Arista Networks
EOS
pkg:rpm/arista/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-2026-73456) in Arista EOS arises from improper control of code generation (CWE-94) when the gNPSI feature is enabled. It allows an unauthenticated gNPSI client to craft malicious requests that lead to arbitrary code execution on the device. Successful exploitation grants the attacker full administrative privileges on the compromised switch. The CVSS 3.1 base score is 10.0, reflecting network attack vector, no privileges or user interaction required, and complete confidentiality, integrity, and availability impact. Affected versions include >=4.36.0 <4.36.2F, >=4.35.0 <4.35.6M, and >=4.34.2F <4.34.8M.
Potential Impact
An attacker can remotely execute arbitrary code without authentication, resulting in full administrative control over the affected Arista EOS switch. This compromises confidentiality, integrity, and availability of the device and network traffic it handles.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until official fixes are available, disable the gNPSI feature if possible to mitigate exposure. Monitor Arista Networks advisories for patches addressing this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Arista
- Date Reserved
- 2026-08-12T16:45:03.510Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aaae7b555bf5e2cf5087540
Added to database: 09/16/2026, 19:02:13 UTC
Last enriched: 09/16/2026, 19:17:57 UTC
Last updated: 09/17/2026, 03:08:13 UTC
Views: 10
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