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CVE-2021-28856

19
FAUCET Score

CVE-2021-28856 describes a division-by-zero vulnerability in Deark prior to version 1.5.8, specifically within the fmtutil.c file, triggered by a specially crafted input file manipulating the pixelsize value. This vulnerability has a medium severity CVSS score of 5.5, indicating a local attack vector with low complexity, requiring user interaction, and leading to high availability impact (denial of service). There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(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
0.84%
Probability of exploitation in next 30 days
EPSS Percentile
54.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0084 is in the 62nd percentile among its peer group of 5,765 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/Division-By-Zero-Deark
PatchThird Party Advisory
github.com / fuzzing2026/CVE-PoCs/tree/main/deark-CVE-2021-28856
github.com / jsummers/deark/commit/62acb7753b0e3c0d3ab3c15057b0a65222313334
PatchThird Party Advisory