How severe is CVE-2023-3966?

CVE-2023-3966 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-3966 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-3966?

CVE-2023-3966 primarily affects Openvswitch. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-3966?

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

Does CVE-2023-3966 have an EU (EUVD) identifier?

Yes. CVE-2023-3966 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-44591.

When was CVE-2023-3966 published?

CVE-2023-3966 was published on 2024-02-22 and last updated on 2026-06-17.

CVE-2023-3966

CVE-2023-3966 is a high-severity vulnerability in Openvswitch with a CVSS 3.x base score of 7.5. 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-248.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-44591
Weakness: CWE-248
Affected product: Openvswitch
Published: 2024-02-22
Last modified: 2026-06-17

Description

A flaw was found in Open vSwitch where multiple versions are vulnerable to crafted Geneve packets, which may result in a denial of service and invalid memory accesses. Triggering this issue requires that hardware offloading via the netlink path is enabled.

Frequently asked questions

What is CVE-2023-3966?: A flaw was found in Open vSwitch where multiple versions are vulnerable to crafted Geneve packets, which may result in a denial of service and invalid memory accesses. Triggering this issue requires that hardware offloading via the netlink path is enabled.
How severe is CVE-2023-3966?: CVE-2023-3966 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-3966 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-3966?: CVE-2023-3966 primarily affects Openvswitch. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-3966?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2023-3966 have an EU (EUVD) identifier?: Yes. CVE-2023-3966 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-44591.
When was CVE-2023-3966 published?: CVE-2023-3966 was published on 2024-02-22 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:40:*:*:*:*:*:*:*

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