CVE-2026-2379: On affected platforms with hardware IPSec support running Arista EOS with certain IPsec features enabled, EOS may exhibit unexpected behavior in specific…

PriorityP431medium5.9CVSS 3.1

AVNACHPRNUINSUCHINAN

EPSS

0.23%

13.2th percentile

On affected platforms with hardware IPSec support running Arista EOS with certain IPsec features enabled, EOS may exhibit unexpected behavior in specific cases. Physical interface flaps and certain agent restarts can cause IPsec tunnel re-establishment with existing Security Associations, resulting in sequence number mismatches between tunnel endpoints potentially causing unstable communication.

Affected

8 ranges

Vendor	Product	Version range	Fixed in
arista_networks	eos	>= 4.27.1F < 4.28.0	4.28.0
arista_networks	eos	>= 4.28.0F < 4.29.0	4.29.0
arista_networks	eos	>= 4.29.0F < 4.30.0	4.30.0
arista_networks	eos	>= 4.30.0F < 4.31.0	4.31.0
arista_networks	eos	4.31.0M – 4.31.9M	—
arista_networks	eos	4.32.0M – 4.32.7M	—
arista_networks	eos	4.33.0M – 4.33.5M	—
arista_networks	eos	4.34.0 – 4.34.3M	—

CVSS provenance

nvdv3.15.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

nvdv4.08.2HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/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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