Buffer overflow in Fiio M6

CVE-2023-30257

A buffer overflow in the component /proc/ftxxxx-debug of FiiO M6 Build Number v1.0.4 allows attackers to escalate privileges to root.

Vulnerability class: Buffer Overflow

Published 2023-05-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (27.2th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Fiio M6
Fiio M6 Firmware — versions 1.0.4

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

dwongdev/sugoi-supernote

References

github.com/stigward/PoCs-and-Exploits/tree/main/fiio_LPE_0day (Exploit)
stigward.github.io/posts/fiio-m6-exploit/ (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2023-30257?: CVE-2023-30257 is a high-severity vulnerability in Fiio M6, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.8/10. Published 2023-05-08.
How severe is CVE-2023-30257?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2023-30257 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.