CVE-2026-6683

4.6 MEDIUM 0.3% exploit odds No fix listed Other

What it is

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.

At a glance

Exploitability: Can be exploited with physical access without logging in. High risk of service disruption.
Exploit odds: 0.3% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2026-07-01 15:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-25 17:10 UTC Last updatedMost recent change to the record

Details

Published: 2026-07-01 15:17 UTC
Last modified: 2026-10-25 17:10 UTC
Exploit probability: 0.3% · EPSS, next 30 days
Weakness: CWE-369
Record status: Analyzed

Affected

elm-chan Fatfs ≤ r0.16

Attack profile CVSS 3.1 · 4.6

Attack vector: Physical
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Raw vector

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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References

NVD record · CVE.org record