CVE•Published 2026-07-01•Modified 2026-07-02•0 articles on news•5 live references•NVD data

CVE-2026-6683Elm-chan · Fatfs

Vulnerability data via NVD (ingested)

CVSS v3.1

4.6

MEDIUM

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

EPSS percentile

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Weaknesses (CWE)

CWE-369Divide By Zero

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.

Timeline

Published 2026-07-01

Modified 2026-07-02

External references

NVD MITRE Exploit-DB trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-6683

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Elm-chan Fatfs"

All exposed Elm-chan Fatfs instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Fatfs"

HTTP body or banner mentions "Fatfs" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-6683