Assistive Listening Knowledge Base
  • Technical research article

CVE-2025-20908: Use of insufficiently random values in Samsung’s Auracast implementation

From https://assistivelisteningknowledgebase.org/evidence/heinze-2025-samsung-auracast-code/ · record checked 13 October 2026

  • Heinze D; Steinmetz F
  • ERNW, Insinuator.net

Independent (ERNW security researchers; separate research funding not stated)

Summary

Researchers describe a weak default broadcast code in Samsung phones, a reported code-recovery demonstration, and the manufacturer's subsequent change to code generation.

Key findings

  • The default code in the examined implementation contained four hexadecimal characters representing only two random bytes. Users could choose a different code.
  • The written demonstration describes a Galaxy S23 broadcast and an nRF5340 development kit, with recovery of the old default code reported in under a second. It is a single described demonstration, not a survey of venue transmitters.
  • The researchers say Samsung changed the default to twelve hexadecimal characters representing six random bytes, and report a patch release on 4 March 2025.
  • The authors connect possession of the code with potential stream takeover and recommend a random code using the available 16-character space. The reported demonstration establishes code recovery; it does not document takeover of an installed venue system.

Limits

Read the complete article through the Wayback Machine after direct requests to the original domain failed DNS resolution. The embedded demonstration video was not watched; timings are attributed to the written account. The byline names Dennis Heinze and the article is signed by Frieder and Dennis. Funding is unstated. Personal phone broadcasting is used only as evidence about the shared broadcast-code mechanism; the result is not evidence that venue transmitters use the same defaults.

Read the original

insinuator.net/2025/03/cve-2025-20908-use-of-insufficiently-random-values-in-samsungs-auracast-implementation

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Cited in

Cite this source

Heinze D; Steinmetz F. CVE-2025-20908: Use of insufficiently random values in Samsung’s Auracast implementation. ERNW, Insinuator.net. 13 March 2025. https://insinuator.net/2025/03/cve-2025-20908-use-of-insufficiently-random-values-in-samsungs-auracast-implementation/ (accessed 13 October 2026).

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