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VulnerabilityPublished Updated

CVE-2026-2379: Arista Networks EOS · Operation on a Resource after Expiration or Release

Affects Arista Networks EOSSource CVE Database V5

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Not known to be exploited · CVSS 5.9 Medium · fixed in 4.31.0 : update Arista Networks EOS when convenient.

Data as of 29 Oct 2026, 19:04 UTC

CVSS 3.1 base score
5.9Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 13% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.31.0, 4.30.0, 4.29.0 +1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 5 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade Arista Networks EOS to 4.31.0, 4.30.0, 4.29.0 or 4.28.0.

Affected software

ProductAffectedFixed in
Arista NetworksEOSAffected
  • >=4.34.0 <=4.34.3M
  • >=4.33.0M <=4.33.5M
  • >=4.32.0M <=4.32.7M
  • >=4.31.0M <=4.31.9M
  • >=4.30.0F <4.31.0
  • >=4.29.0F <4.30.0
  • >=4.28.0F <4.29.0
  • >=4.27.1F <4.28.0
Fixed in
  • 4.31.0
  • 4.30.0
  • 4.29.0
  • 4.28.0

AI-suggested

If you cannot patch yet, operators should be aware of potential IPsec tunnel instability following physical interface flaps or agent restarts on affected versions and consider operational procedures to minimize such events.

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.

References

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