Arista EOS up to 4.34.3M IPsec Feature operation after expiration

Summaryinfo

A vulnerability identified as problematic has been detected in Arista EOS up to 4.34.3M. This vulnerability affects unknown code of the component IPsec Feature. This manipulation causes operation after expiration. This vulnerability is registered as CVE-2026-2379. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Arista EOS up to 4.34.3M. Affected by this vulnerability is some unknown functionality of the component IPsec Feature. The manipulation with an unknown input leads to a operation after expiration vulnerability. The CWE definition for the vulnerability is CWE-672. The product uses, accesses, or otherwise operates on a resource after that resource has been expired, released, or revoked. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

The advisory is shared at arista.com. This vulnerability is known as CVE-2026-2379 since 02/11/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available.

Upgrading to version 4.28.0, 4.29.0, 4.30.0 or 4.31.0 eliminates this vulnerability.

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Productinfo

Vendor

• Arista

Name

• EOS

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9
• 4.10
• 4.11
• 4.12
• 4.13
• 4.14
• 4.15
• 4.16
• 4.17
• 4.18
• 4.19
• 4.20
• 4.21
• 4.22
• 4.23
• 4.24
• 4.25
• 4.26
• 4.27
• 4.28
• 4.29
• 4.30
• 4.31.9M
• 4.32.7M
• 4.33.5M
• 4.34.3M

License

• commercial

CPE 2.3info

• 🔒
• 🔒
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CPE 2.2info

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• 🔒
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Entryinfo

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