VDB-243741 · CVE-2023-46407 · GCVE-0-2023-46407

FFmpeg read_vlc_prefix alphabet_size out-of-bounds

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.8	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in FFmpeg. This vulnerability affects the function read_vlc_prefix. Performing a manipulation of the argument alphabet_size results in out-of-bounds. This vulnerability is identified as CVE-2023-46407. The attack can be initiated remotely. There is not any exploit available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability, which was classified as problematic, was found in FFmpeg (Multimedia Processing Software) (affected version unknown). This affects the function read_vlc_prefix. The manipulation of the argument alphabet_size with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality. The summary by CVE is:

FFmpeg prior to commit bf814 was discovered to contain an out of bounds read via the dist->alphabet_size variable in the read_vlc_prefix() function.

The weakness was released 10/27/2023 as bf814387f42e9b0dea9d75c03db4723c88e7d962. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2023-46407 since 10/23/2023. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

Applying the patch bf814387f42e9b0dea9d75c03db4723c88e7d962 is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

Type

Multimedia Processing Software

Name

FFmpeg

License

open-source

Website

Product: https://ffmpeg.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.9
VulDB Meta Temp Score: 4.8

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: bf814387f42e9b0dea9d75c03db4723c88e7d962

Timelineinfo

10/23/2023 🔍
10/27/2023 +4 days 🔍
10/27/2023 +0 days 🔍
08/11/2025 +654 days 🔍

Sourcesinfo

Product: ffmpeg.org

Advisory: bf814387f42e9b0dea9d75c03db4723c88e7d962
Status: Confirmed

CVE: CVE-2023-46407 (🔍)
GCVE (CVE): GCVE-0-2023-46407
GCVE (VulDB): GCVE-100-243741

Entryinfo

Created: 10/27/2023 23:30
Updated: 08/11/2025 15:49
Changes: 10/27/2023 23:30 (42), 11/19/2023 10:04 (11), 08/11/2025 15:49 (16)
Complete: 🔍
Cache ID: 216::103