Dashboard / CVE-2026-6683

CVE-2026-6683

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 44/100
Published: 2026-07-01 Modified: 2026-10-25 First seen: 2026-10-29 Status: active

Attack Surface

Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Physical
AC: Low
PR: None
UI: None
S: Unchanged
C: None
I: None
A: High

Description

FatFs R0.16 and earlier contains a divide-by-zero in exFAT sync logic bug when crafted metadata causes n_fatent - 2 to be zero during write/sync operations. This maps to CWE-369 (Divide By Zero). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (4.6, Medium). Network-delivered update media can make this remote in some pipelines. The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Partial.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
elm-chan fatfs < r0.16

References & Advisories (4)

https://www.runzero.com/blog/fatfs-bugs/
Third Party Advisory Exploit

Bug Bounty Relevance

44 / 100
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

4.6 / 10.0 v3.1
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploitation Probability

0.31%
Raw Score 0.003060
Percentile 23.3%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00306
2026-10-28
0.00306

Intelligence Sources

nvd ref →

External Links