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Vulnerability details

CVE-2026-2379

Arista Networks EOS

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

CVSS 4.0
8.2High

Official description

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.

CVSS scores

ScoreVersionSourceVector
8.2High 4.0 CVEProject cvelistV5 (CNA) (Arista) CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
5.9Medium 3.1 CVEProject cvelistV5 (CNA) (Arista) CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

VendorProductVersionsSource
Arista Networks EOS 4.27.1F ≤ v < 4.28.0 CVEProject cvelistV5 (CNA)
Arista Networks EOS 4.28.0F ≤ v < 4.29.0 CVEProject cvelistV5 (CNA)
Arista Networks EOS 4.29.0F ≤ v < 4.30.0 CVEProject cvelistV5 (CNA)
Arista Networks EOS 4.30.0F ≤ v < 4.31.0 CVEProject cvelistV5 (CNA)
Arista Networks EOS 4.31.0M ≤ v ≤ 4.31.9M CVEProject cvelistV5 (CNA)
Arista Networks EOS 4.32.0M ≤ v ≤ 4.32.7M CVEProject cvelistV5 (CNA)
Arista Networks EOS 4.33.0M ≤ v ≤ 4.33.5M CVEProject cvelistV5 (CNA)
Arista Networks EOS 4.34.0 ≤ v ≤ 4.34.3M CVEProject cvelistV5 (CNA)

References and advisories

1
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Details

Published
2026-06-05
Last updated
2026-06-09
State
Published
Assigner (CNA)
Arista

Exploit prediction (EPSS)

0.22%
Probability of exploitation in 30 days
13.3%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
None
Technical impact
Partial

Weaknesses (CWE)

  • CWE-672
    Operation on a Resource after Expiration or Release