CVE-2026-2379 — Arista EOS IPsec Tunnel Sequence Number Mismatch via Interface Flaps when Anti-Replay is Disabled

Description (CNA)

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 (CNA)

Vendor / product	Versions
Arista Networks / EOS	affected 4.34.0 through 4.34.3M; affected 4.33.0M through 4.33.5M; affected 4.32.0M through 4.32.7M; affected 4.31.0M through 4.31.9M; affected 4.30.0F before 4.31.0; affected 4.29.0F before 4.30.0; affected 4.28.0F before 4.29.0; affected 4.27.1F before 4.28.0

CWE

CWE-672

References

https://www.arista.com/en/support/advisories-notices/security-advisory/23419-security-advisory-0134

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.