Arista NetworksCVE-2026-73456
Arista Networks EOS: remote code execution
Critical9.2CVE-2026-73456 · Published Sep 16, 2026 · updated Sep 17, 2026
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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| EOS Product | >= 4.36.0, <= 4.36.1F | No fix yet |
| >= 4.35.0, <= 4.35.5M | No fix yet | |
| >= 4.34.2F, <= 4.34.7M | No fix yet |
Details and references
- CVSS 4.0
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-94
More Arista Networks advisories
All Arista Networks| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Sep 16 | Arista Networks EOS: secrets in logs | Medium6.0 | No fix yet |
| Sep 16 | Arista Networks EOS: out-of-bounds read | High7.1 | No fix yet |
| Sep 16 | Arista Networks EOS: secrets in logs | Low2.1 | No fix yet |
| Sep 16 | Arista Networks EOS: denial of service | Medium5.3 | No fix yet |
| Sep 16 | Arista Networks VeloCloud Edge: missing authentication | High8.7 | 5.2.0.0+3 more |
| Sep 16 | Arista Networks VeloCloud: out-of-bounds write | High8.2 | 5.2.0.0+3 more |