CVE-2026-2379
Medium
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.
SeverityMedium
CVSS5.9
Exploit probability—
ProductEOS
PublishedJun 5, 2026
First seenJun 5, 2026
Weakness typeCWE-672CWE-672
How to fix
Update
- Arista Networks EOS4.31.0, 4.30.0, 4.29.0, 4.28.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Arista Networks EOS | 4.34.0 ≤ v ≤ 4.34.3M, 4.33.0M ≤ v ≤ 4.33.5M, 4.32.0M ≤ v ≤ 4.32.7M, 4.31.0M ≤ v ≤ 4.31.9M, 4.30.0F ≤ v < 4.31.0, 4.29.0F ≤ v < 4.30.0, 4.28.0F ≤ v < 4.29.0, 4.27.1F ≤ v < 4.28.0 | 4.31.0, 4.30.0, 4.29.0, 4.28.0 |
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