CVE-2026-6683

mediumCVSS 4.6covered by 1 sourcefirst seen 2026-07-01

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.

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Exploitation outlook

Low exploitation risk0.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 11% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-6683: FatFs R0.16 and earlier contains a divide-by-zero in exFAT sync logic bug when crafted metadata…nvd · 2026-07-01

External references

NVD record for CVE-2026-6683

CVE.org record

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