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01 Record

CVE-2026-2379

Arista EOS IPsec Tunnel Sequence Number Mismatch via Interface Flaps when Anti-Replay is Disabled

HighPUBLISHEDCNA: Arista
CNA base score8.2 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

02 Description

Arista EOS IPsec Tunnel Sequence Number Mismatch via Interface Flaps when Anti-Replay is Disabled

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.22% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 13.1% of scored records. A rank, not a probability.
NVD base score
8.2 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD analysis status
Awaiting Analysis. NVD last modified this record on 2026-10-26.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-06-05 17:59Z4 MO AGO
Last updated
2026-06-09 14:36Z4 MO AGO
Reserved
2026-02-11
Assigning CNA
Arista
Record state
PUBLISHED
Severity
High (CVSS 8.2)
CNA CVSS vector
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
Weaknesses
  • CWE-672Operation on a Resource after Expiration or ReleaseClass
Data version
5.2
Document digest
6135dce1ce9024118bc5d93e52ff77ee34d923442e3d5dd3f712b81f50cb2c9d

05 Affected products

VendorProductVersionsPlatforms
Arista NetworksEOS4.34.0 to 4.34.3M, 4.33.0M to 4.33.5M, 4.32.0M to 4.32.7M, 4.31.0M to 4.31.9M, 4.30.0F to < 4.31.0, 4.29.0F to < 4.30.0, 4.28.0F to < 4.29.0, 4.27.1F to < 4.28.07280R3 Series with IPsec (DCS-7280SR3AK, DCS-7280SR3AM, DCS-7280CR3AK, DCS-7280CR3AM, DCS-7280CR3MK, DCS-7280DR3AK, DCS-7280DR3AM, DCS-7289R3AK-SC, DCS-7289R3AM-SC), 7800R3 Series with IPsec (7800R3A-36DM-LC, 7800R3AK-36DM-LC, 7800R3A-36PM-LC, 7800R3AK-36PM-LC, 7800R3A-36DM2-LC, 7800R3AK-36DM2-LC), AWE 7000 Series with IPsec (AWE-7250R-16S-F, AWE-7230R-4TX-4S-F, AWE-7220RP-5TH-2S-F), AWE 5000 Series with IPsec (AWE-5510, AWE-5310), CloudEOS VM

06 References

07 Remediation

The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below. For more information about upgrading see: EOS User Manual: Upgrades and Downgrades https://www.arista.com/en/um-eos/eos-upgrades-and-downgrades CVE-2026-2379 has been fixed in the following releases: * 4.35.0F and later releases in the 4.35.x train * 4.34.4M and later releases in the 4.34.x train * 4.33.6M and later releases in the 4.33.x train * 4.32.8M and later releases in the 4.32.x train * 4.31.10M and later releases in the 4.31.x train