FFmpeg 4.2.1 vf_convolution.c filter_sobel integer overflow

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k0.00

Summaryinfo

A vulnerability was found in FFmpeg 4.2.1. It has been classified as problematic. This affects the function filter_sobel of the file libavfilter/vf_convolution.c. This manipulation causes integer overflow. This vulnerability is handled as CVE-2021-38094. The attack can be initiated remotely. There is not any exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability classified as critical was found in FFmpeg 4.2.1 (Multimedia Processing Software). Affected by this vulnerability is the function filter_sobel of the file libavfilter/vf_convolution.c. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was released 09/20/2021 as 8263. It is possible to read the advisory at trac.ffmpeg.org. This vulnerability is known as CVE-2021-38094 since 08/04/2021. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 257917 (Linux Distros Unpatched Vulnerability : CVE-2021-38094), which helps to determine the existence of the flaw in a target environment.

Applying the patch 99f8d32129dd233d4eb2efa44678a0bc44869f23 is able to eliminate this problem. The bugfix is ready for download at git.ffmpeg.org.

The vulnerability is also documented in the vulnerability database at Tenable (257917). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.4

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 257917
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2021-38094

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 99f8d32129dd233d4eb2efa44678a0bc44869f23

Timelineinfo

08/04/2021 🔍
09/20/2021 +47 days 🔍
09/20/2021 +0 days 🔍
08/30/2025 +1440 days 🔍

Sourcesinfo

Product: ffmpeg.org

Advisory: 8263
Status: Confirmed

CVE: CVE-2021-38094 (🔍)
GCVE (CVE): GCVE-0-2021-38094
GCVE (VulDB): GCVE-100-182971

Entryinfo

Created: 09/20/2021 22:00
Updated: 08/30/2025 19:27
Changes: 09/20/2021 22:00 (42), 09/29/2021 13:47 (1), 09/29/2021 13:53 (18), 08/30/2025 19:27 (16)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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