Operation on a Resource after Expiration or Release in Arista Extensible Operating System (EOS) and Arista CloudEOS VM - CVE-2026-2379
Published: April 15, 2026
Vulnerability identifier: #VU126170
CSH Severity: Medium
CVSS v4: 8.2 [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]
CVE-ID: CVE-2026-2379
CWE-ID: CWE-672
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to operation on a resource after expiration or release in the IPsec tunnel re-establishment handling when re-establishing IPsec tunnels after physical interface flaps or certain agent restarts. A remote attacker can trigger sequence number mismatches between tunnel endpoints to disclose sensitive information.
Only systems with certain IPsec features enabled and IPsec anti-replay detection disabled are vulnerable.
Affected software
Arista Extensible Operating System (EOS)
Arista CloudEOS VM
Arista CloudEOS VM
How to mitigate CVE-2026-2379
Install security update from vendor's website.
Arista Extensible Operating System (EOS) - addressed in versions 4.31.10M, 4.32.8M, 4.33.6M, 4.34.4M, 4.35.0F
Arista CloudEOS VM - addressed in versions 4.31.10M, 4.32.8M, 4.33.6M, 4.34.4M, 4.35.0F
Arista CloudEOS VM - addressed in versions 4.31.10M, 4.32.8M, 4.33.6M, 4.34.4M, 4.35.0F