How severe is CVE-2023-29340?

CVE-2023-29340 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-29340 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-29340?

CVE-2023-29340 affects Microsoft Av1 Video Extension. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-29340?

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.

When was CVE-2023-29340 published?

CVE-2023-29340 was published on 2023-05-09 and last updated on 2026-06-17.

CVE-2023-29340

CVE-2023-29340 is a high-severity vulnerability in Microsoft Av1 Video Extension with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Av1 Video Extension
Published: 2023-05-09
Last modified: 2026-06-17

Description

AV1 Video Extension Remote Code Execution Vulnerability

Frequently asked questions

What is CVE-2023-29340?: AV1 Video Extension Remote Code Execution Vulnerability
How severe is CVE-2023-29340?: CVE-2023-29340 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-29340 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-29340?: CVE-2023-29340 affects Microsoft Av1 Video Extension. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-29340?: 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.
When was CVE-2023-29340 published?: CVE-2023-29340 was published on 2023-05-09 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-29340

Affected products (1)

cpe:2.3:a:microsoft:av1_video_extension:*:*:*:*:*:*:*:*