Vulnerability-Lookup

FKIE_CVE-2021-28856

Vulnerability from fkie_nvd - Published: 2021-04-14 17:15 - Updated: 2026-06-17 03:46

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Summary

In Deark before v1.5.8, a specially crafted input file can cause a division by zero in (src/fmtutil.c) because of the value of pixelsize.

References

URL	Tags
cve@mitre.org	https://fatihhcelik.github.io/posts/Division-By-Zero-Deark/	Patch, Third Party Advisory
cve@mitre.org	https://github.com/fuzzing2026/CVE-PoCs/tree/main/deark-CVE-2021-28856
cve@mitre.org	https://github.com/jsummers/deark/commit/62acb7753b0e3c0d3ab3c15057b0a65222313334	Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://fatihhcelik.github.io/posts/Division-By-Zero-Deark/	Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/jsummers/deark/commit/62acb7753b0e3c0d3ab3c15057b0a65222313334	Patch, Third Party Advisory

Impacted products

	Vendor	Product	Version
	entropymine	deark	*

JSON

To clipboard

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    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
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      ],
      "source": "cve@mitre.org"
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  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:entropymine:deark:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "DDEFD567-5B77-4505-9D83-F9A2EF0BBAB3",
              "versionEndExcluding": "1.5.8",
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          "negate": false,
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In Deark before v1.5.8, a specially crafted input file can cause a division by zero in (src/fmtutil.c) because of the value of pixelsize."
    },
    {
      "lang": "es",
      "value": "En Deark antes antes de la versi\u00f3n v1.5.8, un archivo de entrada especialmente dise\u00f1ado puede causar una divisi\u00f3n por cero en (src/fmtutil.c) debido al valor de pixelsize"
    }
  ],
  "id": "CVE-2021-28856",
  "lastModified": "2026-06-17T03:46:59.517",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 4.3,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  },
  "published": "2021-04-14T17:15:14.427",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://fatihhcelik.github.io/posts/Division-By-Zero-Deark/"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/fuzzing2026/CVE-PoCs/tree/main/deark-CVE-2021-28856"
    },
    {
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      "tags": [
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
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    },
    {
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      "tags": [
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    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-369"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2021-28856 (GCVE-0-2021-28856)

Vulnerability from cvelistv5 – Published: 2021-04-14 16:11 – Updated: 2026-01-26 16:30

Summary

In Deark before v1.5.8, a specially crafted input file can cause a division by zero in (src/fmtutil.c) because of the value of pixelsize.

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

3 references

URL	Tags
https://fatihhcelik.github.io/posts/Division-By-Z…
https://github.com/jsummers/deark/commit/62acb775…
https://github.com/fuzzing2026/CVE-PoCs/tree/main…

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.