Arista NetworksCVE-2026-73451
On affected platforms running Arista EOS with dual switch cards and with...
Medium6.3CVE-2026-73451 · Published Sep 15, 2026 · updated Sep 16, 2026
On affected platforms running Arista EOS with dual switch cards and with ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in shared mode, restarting of the secondary switchcard forwarding agent or insertion of secondary switchcard, can cause security ACLs on shared SVIs to stop functioning. This may result in incorrect packet permit/deny behavior. This issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| EOS Product | >= 4.36.0, <= 4.36.0.1F | No fix yet |
| >= 4.35.0, <= 4.35.4M | No fix yet | |
| >= 4.34.0, <= 4.34.6M | No fix yet | |
| >= 4.33.0, <= 4.33.8M | No fix yet |
Details and references
- CVSS 4.0
- CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/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)
More Arista Networks advisories
All Arista Networks| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Sep 15 | Arista Networks EOS: denial of service | Medium6.5 | No fix yet |
| Sep 15 | On affected platforms running Arista EOS with VRRPv2 IP Authentication Header | Medium5.3 | No fix yet |
| Sep 15 | Arista Networks EOS: improper input validation | High7.1 | No fix yet |
| Sep 15 | On affected platforms running Arista EOS with authenticated Bidirectional... | Critical9.2 | No fix yet |
| Sep 15 | Arista Networks EOS: secrets in logs | Medium6.0 | No fix yet |
| Sep 15 | Arista Networks EOS: secrets in logs | Medium6.0 | No fix yet |