{"cve":"CVE-2021-28855","nvd":{"published":"2021-04-14T17:15:14.363","modified":"2026-06-17T03:46:59.400","status":"Modified","description":"In Deark before 1.5.8, a specially crafted input file can cause a NULL pointer dereference in the dbuf_write function (src/deark-dbuf.c).","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://fatihhcelik.github.io/posts/NULL-Pointer-Dereference-Deark/","https://github.com/fuzzing2026/CVE-PoCs/tree/main/deark-CVE-2021-28855","https://github.com/jsummers/deark/commit/287f5ac31dfdc074669182f51ece637706070eeb","https://fatihhcelik.github.io/posts/NULL-Pointer-Dereference-Deark/","https://github.com/jsummers/deark/commit/287f5ac31dfdc074669182f51ece637706070eeb"],"products":["entropymine:deark"],"source":"nvd","synced_at":"2026-10-19T21:17:01.373894544+00:00"},"epss":{"cve":"CVE-2021-28855","score":0.00895,"percentile":0.5952,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}