CVE-2025-54957

Published Oct 20, 2025

Last updated a month ago

CVSS critical 9.8

Dolby UDC

DD+ Decoder

Evolution

Overview

AI description

Automated description summarized from trusted sources.

CVE-2025-54957 is a buffer overflow vulnerability affecting Dolby Universal Decoder Core (UDC) versions 4.5 through 4.13. The flaw resides within the Dolby Digital Plus (DD+) decoder process and can be triggered by processing specially crafted, malformed DD+ bitstreams. Specifically, an integer overflow occurs during the length calculation when the `evo_priv.c` component parses "Evolution data" from the DD+ bitstream. This results in an undersized buffer being allocated, which then renders subsequent out-of-bounds checks ineffective and leads to an out-of-bounds write condition. Google Project Zero researchers discovered this vulnerability, highlighting its potential for zero-click exploitation on mobile devices, as audio attachments and voice messages are often decoded automatically.

Description: An issue was discovered in Dolby UDC 4.5 through 4.13. A crash of the DD+ decoder process can occur when a malformed DD+ bitstream is processed. When Evolution data is processed by evo_priv.c from the DD+ bitstream, the decoder writes that data into a buffer. The length calculation for a write can overflow due to an integer wraparound. This can lead to the allocated buffer being too small, and the out-of-bounds check of the subsequent write to be ineffective, leading to an out-of-bounds write.
Source: cve@mitre.org
NVD status: Deferred

Risk scores

CVSS 3.1

Type: Secondary
Base score: 9.8
Impact score: 5.9
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: CRITICAL

Weaknesses

134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-190

Hype score is a measure of social media activity compared against trending CVEs from the past 12 months. Max score 100.

Hype score: 31

References

Sources include official advisories and independent security research.