External risk intelligence

Dolby UDC Integer Wraparound Out-of-Bounds Write

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2025-54957

The vulnerability exists in a media decoder process (Dolby UDC) responsible for processing bitstreams, typically found in localized media playback components or hardware-embedded systems. It is not an internet-facing service, API, or gateway. Exploitation requires delivering a malformed file or stream to a specific local application or media parser, making public internet exposure and direct reachability very unlikely.

Integer Overflow

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

An issue has been identified in Dolby UDC software related to processing media bitstreams. This vulnerability could allow for a crash or out-of-bounds write when handling specially crafted data, potentially impacting the integrity and availability of the affected process. The main concern is confirming relevance and exposure within our environment.

A software flaw can cause media processing to crash.
It involves how data is handled, risking system stability.
Confirm if our use of this software is exposed.

Attack Path

How an attacker could exploit the issue

An attacker could send a specially crafted audio file to a system processing Dolby Digital Plus (DD+) audio. The system's DD+ decoder would then attempt to process this malformed data, leading to a buffer overflow and an out-of-bounds write. This could allow an attacker to corrupt memory, potentially leading to a crash or the execution of malicious code.

Requires malformed audio file.
Triggers on DD+ bitstream processing.
Leads to memory corruption and crash.

Live Threat

Current exploitation, exposure, and threat context

A crash of the Dolby DD+ decoder process could occur when processing a malformed DD+ bitstream. This vulnerability may lead to an out-of-bounds write when Evolution data is processed, potentially affecting the integrity of the decoder process.

Decoder process integrity.
Malformed bitstream processing.
Unpredictable decoder behavior.

Operational Fix

Recommended remediation, mitigation, and detection steps

Teams responsible for media processing, digital rights management, or embedded systems within consumer electronics are likely to own this issue. The first practical move is to identify all Dolby UDC instances, confirm their network exposure and criticality, and then assign an owner for remediation planning.

Assign ownership to media processing teams.
Verify Dolby UDC instances and exposure.
Plan remediation based on risk assessment.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is Dolby UDC?

Dolby UDC (Universal Decoder) is a software component designed to process and decode various audio formats, including Dolby Digital Plus (DD+). It is commonly integrated into media playback systems, consumer electronics, and specialized hardware to ensure high-quality audio reproduction. Users of this software are typically developers or manufacturers building audio-visual applications or embedded media devices.

What does CVE-2025-54957 mean for system memory?

This vulnerability involves two weakness classes: integer wraparound (CWE-190) and out-of-bounds write (CWE-787). When the decoder processes a malformed DD+ bitstream, a mathematical error in the length calculation causes the program to allocate an insufficient amount of memory. Consequently, the software attempts to write data beyond the boundaries of that buffer, which can corrupt nearby memory and potentially cause a crash or unintended code execution.

How is the Dolby UDC vulnerability triggered?

The flaw is triggered specifically when the decoder processes a malformed DD+ audio bitstream containing malicious 'Evolution' data. It is important to note that standard, well-formed audio files do not trigger this error; the system must encounter data specifically crafted to exploit the buffer overflow condition during the decoding process.

Do I need to worry about internet exposure for CVE-2025-54957?

According to Halo Surface Signal, this vulnerability is very unlikely to be reachable via the public internet. Because the defect resides in a media decoder process rather than an internet-facing service or API, it primarily affects localized media playback or hardware-embedded systems that must ingest and process untrusted audio files directly.

What should I do if I use Dolby UDC?

Your first step is to perform an inventory to locate all instances of Dolby UDC software within your environment. Once identified, evaluate whether these instances process untrusted audio content from external sources. Finally, assign ownership to the appropriate media processing or engineering team to monitor for official guidance and plan remediation based on the risk level of the affected systems.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.