PT-2021-17965 · Deark · Deark

Fatih Çelik · CVE-2021-28855 · Published 2021-04-14 · Updated 2026-01-26

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions: Deark versions prior to 1.5.8

Description: The issue arises from a specially crafted input file that can cause a NULL pointer dereference in the dbuf write function, located in src/deark-dbuf.c.

Recommendations: For versions prior to 1.5.8, update to version 1.5.8 or later to resolve the issue.

Exploit

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2021-28855

Affected Products

Deark

References · 6

• 🔥 https://github.com/fuzzing2026/CVE-PoCs/tree/main/deark-CVE-2021-28855 · Exploit
• https://github.com/jsummers/deark/commit/287f5ac31dfdc074669182f51ece637706070eeb · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-28855 · Security Note
• https://osv.dev/vulnerability/CVE-2021-28855 · Vendor Advisory
• https://fatihhcelik.github.io/posts/NULL-Pointer-Dereference-Deark · Patch
• https://t.me/cveNotify/149892 · Telegram Post