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

8.2HIGH

Key Information:

Vendor

Arista Networks

Status
Eos
Vendor
CVE Published:
5 June 2026

What is 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 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 Version(s)

EOS 7280R3 Series with IPsec (DCS-7280SR3AK 4.34.0 <= 4.34.3M

EOS 7280R3 Series with IPsec (DCS-7280SR3AK 4.33.0M <= 4.33.5M

EOS 7280R3 Series with IPsec (DCS-7280SR3AK 4.32.0M <= 4.32.7M

References

https://www.arista.com/en/support/advisories-notices/secu...
vendor-advisory

CVSS V4

Score:
8.2
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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