CVE-2021-28855

5.5 MEDIUM
Published: April 14, 2021 Modified: January 26, 2026
View on NVD

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).

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

Login to generate AI explanation

CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://fatihhcelik.github.io/posts/NULL-Pointer-Dereference-Deark/
Source: cve@mitre.org
Patch Third Party Advisory
https://github.com/fuzzing2026/CVE-PoCs/tree/main/deark-CVE-2021-28855
Source: cve@mitre.org
https://github.com/jsummers/deark/commit/287f5ac31dfdc074669182f51ece637706070eeb
Source: cve@mitre.org
Patch Third Party Advisory
https://fatihhcelik.github.io/posts/NULL-Pointer-Dereference-Deark/
Source: af854a3a-2127-422b-91ae-364da2661108
Patch Third Party Advisory
https://github.com/jsummers/deark/commit/287f5ac31dfdc074669182f51ece637706070eeb
Source: af854a3a-2127-422b-91ae-364da2661108
Patch Third Party Advisory

5 reference(s) from NVD

Quick Stats

CVSS v3 Score
5.5 / 10.0
EPSS (Exploit Probability)
0.2%
42th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

CWE-476

Affected Vendors

entropymine

Related CVEs

CVE-2026-4491 8.8
CVE-2026-4490 8.8
CVE-2026-29828 N/A
CVE-2026-22902 N/A
CVE-2026-22901 N/A