CVE-2026-73451

published 2026-09-15

CVE-2026-73451: On affected platforms running Arista EOS with dual switch cards and with ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in shared mode…

Priority P4 25 medium 4.8 CVSS 3.1

AV N AC H PR N UI N S U C L I L A N

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

6 ranges

Vendor	Product	Version range	Fixed in
arista_networks	eos	4.31.1F – 4.31.10M	—
arista_networks	eos	4.32.0 – 4.32.11M	—
arista_networks	eos	4.33.0 – 4.33.8M	—
arista_networks	eos	4.34.0 – 4.34.6M	—
arista_networks	eos	4.35.0 – 4.35.4M	—
arista_networks	eos	4.36.0 – 4.36.0.1F	—

CVSS provenance

nvd v3.1 4.8 MEDIUM CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

nvd v4.0 6.3 MEDIUM 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

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CWE-1419