How severe is CVE-2024-12378?

CVE-2024-12378 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2024-12378 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2024-12378?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2024-12378 have an EU (EUVD) identifier?

Yes. CVE-2024-12378 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-54462.

When was CVE-2024-12378 published?

CVE-2024-12378 was published on 2025-05-08 and last updated on 2026-06-17.

CVE-2024-12378

CVE-2024-12378 is a critical-severity vulnerability with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-319.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-54462
Weakness: CWE-319
Published: 2025-05-08
Last modified: 2026-06-17

Description

On affected platforms running Arista EOS with secure Vxlan configured, restarting the Tunnelsec agent will result in packets being sent over the secure Vxlan tunnels in the clear.

Frequently asked questions

What is CVE-2024-12378?: On affected platforms running Arista EOS with secure Vxlan configured, restarting the Tunnelsec agent will result in packets being sent over the secure Vxlan tunnels in the clear.
How severe is CVE-2024-12378?: CVE-2024-12378 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2024-12378 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2024-12378?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2024-12378 have an EU (EUVD) identifier?: Yes. CVE-2024-12378 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-54462.
When was CVE-2024-12378 published?: CVE-2024-12378 was published on 2025-05-08 and last updated on 2026-06-17.

References

https://www.arista.com/en/support/advisories-notices/security-advisory/21289-security-advisory-0113

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