CVE-2026-2379Arista EOS IPsec Tunnel Sequence Number Mismatch via Interface Flaps when Anti-Replay is Disabled
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It affects Arista Networks EOS. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 5.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-672
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Arista
- NVD analysis
- Awaiting Analysis
- Record last updated
- Jun 9, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Arista Networks EOS arista_networks:eos (from the name) | from 4.34.0 through 4.34.3M; from 4.33.0M through 4.33.5M; from 4.32.0M through 4.32.7M; from 4.31.0M through 4.31.9M; from 4.30.0F before 4.31.0; from 4.29.0F before 4.30.0; from 4.28.0F before 4.29.0; from 4.27.1F before 4.28.0 | CNA record |
References
- https://www.arista.com/en/support/advisories-notices/security-advisory/23419-security-advisory-0134vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.