CVE-2021-28855

FAUCET Score

CVE-2021-28855 is a NULL pointer dereference vulnerability in entropymine deark versions prior to 1.5.8, specifically within the dbuf_write function. This medium severity vulnerability (CVSS 5.5) requires user interaction, as an attacker would need to trick a user into processing a specially crafted input file, leading to a denial of service. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		< 1.5.8CPE matchmatch criteria	cpe:2.3:a:entropymine:deark::::::::

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

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

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

Exploitability Score

1.8

Impact Score

3.6

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.90%

Probability of exploitation in next 30 days

EPSS Percentile

55.8%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0089 is in the 65th percentile among its peer group of 5,760 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference

View patch

References

fatihhcelik.github.io / posts/NULL-Pointer-Dereference-Deark

PatchThird Party Advisory

github.com / fuzzing2026/CVE-PoCs/tree/main/deark-CVE-2021-28855

github.com / jsummers/deark/commit/287f5ac31dfdc074669182f51ece637706070eeb

PatchThird Party Advisory