VDB-173089 · CVE-2021-28855 · GCVE-0-2021-28855

Deark up to 1.5.7 src/deark-dbuf.c dbuf_write null pointer dereference

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.4	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Deark up to 1.5.7. It has been rated as problematic. This issue affects the function dbuf_write of the file src/deark-dbuf.c. This manipulation causes null pointer dereference. The identification of this vulnerability is CVE-2021-28855. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic was found in Deark up to 1.5.7. Affected by this vulnerability is the function dbuf_write of the file src/deark-dbuf.c. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability.

The weakness was shared 04/15/2021. The advisory is shared at fatihhcelik.github.io. This vulnerability is known as CVE-2021-28855. Technical details are known, but no exploit is available.

Upgrading to version 1.5.8 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

Deark

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.5
VulDB Meta Temp Score: 4.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Deark 1.5.8
Patch: github.com

Timelineinfo

03/19/2021 🔍
04/15/2021 +26 days 🔍
04/15/2021 +0 days 🔍
01/26/2026 +1747 days 🔍

Sourcesinfo

Advisory: fatihhcelik.github.io
Status: Confirmed

CVE: CVE-2021-28855 (🔍)
GCVE (CVE): GCVE-0-2021-28855
GCVE (VulDB): GCVE-100-173089

Entryinfo

Created: 04/15/2021 11:58
Updated: 01/26/2026 20:02
Changes: 04/15/2021 11:58 (39), 04/21/2021 11:04 (5), 04/21/2021 11:10 (18), 01/26/2026 20:02 (16)
Complete: 🔍
Cache ID: 216::103