CVE-2026-6683
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.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 4.6
- CVSS vector
- CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS probability
- 0.31%
- CWE
- CWE-369
- Published
- 2026-07-01
- Last modified
- 2026-07-01
Affected products
- ChaN FatFs
Weakness type
Related vulnerabilities
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