CVE-2021-28855 - Vulnerability Details - OpenCVE

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).

Published: 2021-04-14

Score: 5.5 Medium

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

n/a

n/a

affected

Version	Status	Constraints
`n/a`	affected	—

Configuration 1 [-]

cpe:2.3:a:entropymine:deark:*:*:*:*:*:*:*:*

No data.

No data available yet.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
EUVD	EUVD-2021-15509	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).

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction Required

No CVSS v3.0

Access Vector Network

Access Complexity Medium

Authentication None

Confidentiality Impact None

Integrity Impact None

Availability Impact Partial

This CVE is not in the KEV list.

The EPSS score is 0.00198.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://fatihhcelik.github.io/posts/NULL-Pointer-Dereference-Deark/
https://github.com/fuzzing2026/CVE-PoCs/tree/main/deark-CVE-2021-28855
https://github.com/jsummers/deark/commit/287f5ac31dfdc074669182f51ece637706070eeb

History

Mon, 26 Jan 2026 16:45:00 +0000

Type	Values Removed	Values Added
References		https://github.com/fuzzing2026/CVE-PoCs/tree/main/deark-CVE-2021-28855

Subscriptions

Entropymine Deark

MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2021-04-14T16:11:11.000Z

Updated: 2026-01-26T16:23:52.247Z

Reserved: 2021-03-19T00:00:00.000Z

Link: CVE-2021-28855

Vulnrichment

No data.

NVD

Status : Modified

Published: 2021-04-14T17:15:14.363

Modified: 2026-01-26T17:16:08.120

Link: CVE-2021-28855

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

CWE-476

{"containers": {"cna": {"affected": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "descriptions": [{"lang": "en", "value": "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)."}], "problemTypes": [{"descriptions": [{"description": "n/a", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2026-01-26T16:23:52.247Z", "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre"}, "references": [{"url": "https://fatihhcelik.github.io/posts/NULL-Pointer-Dereference-Deark/"}, {"url": "https://github.com/jsummers/deark/commit/287f5ac31dfdc074669182f51ece637706070eeb"}, {"url": "https://github.com/fuzzing2026/CVE-PoCs/tree/main/deark-CVE-2021-28855"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "cve@mitre.org", "ID": "CVE-2021-28855", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "n/a", "version": {"version_data": [{"version_value": "n/a"}]}}]}, "vendor_name": "n/a"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "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)."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "n/a"}]}]}, "references": {"reference_data": [{"name": "https://fatihhcelik.github.io/posts/NULL-Pointer-Dereference-Deark/", "refsource": "MISC", "url": "https://fatihhcelik.github.io/posts/NULL-Pointer-Dereference-Deark/"}, {"name": "https://github.com/jsummers/deark/commit/287f5ac31dfdc074669182f51ece637706070eeb", "refsource": "MISC", "url": "https://github.com/jsummers/deark/commit/287f5ac31dfdc074669182f51ece637706070eeb"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T21:55:11.826Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://fatihhcelik.github.io/posts/NULL-Pointer-Dereference-Deark/"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/jsummers/deark/commit/287f5ac31dfdc074669182f51ece637706070eeb"}]}]}, "cveMetadata": {"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "cveId": "CVE-2021-28855", "datePublished": "2021-04-14T16:11:11.000Z", "dateReserved": "2021-03-19T00:00:00.000Z", "dateUpdated": "2026-01-26T16:23:52.247Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.2"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:entropymine:deark:*:*:*:*:*:*:*:*", "matchCriteriaId": "DDEFD567-5B77-4505-9D83-F9A2EF0BBAB3", "versionEndExcluding": "1.5.8", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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)."}, {"lang": "es", "value": "En Deark versiones anteriores a 15.8, un archivo de entrada especialmente dise\u00f1ado puede causar una desreferencia del puntero NULL en la funci\u00f3n dbuf_write (en el archivo src/deark-dbuf.c)"}], "id": "CVE-2021-28855", "lastModified": "2026-01-26T17:16:08.120", "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"}]}, "published": "2021-04-14T17:15:14.363", "references": [{"source": "cve@mitre.org", "tags": ["Patch", "Third Party Advisory"], "url": "https://fatihhcelik.github.io/posts/NULL-Pointer-Dereference-Deark/"}, {"source": "cve@mitre.org", "url": "https://github.com/fuzzing2026/CVE-PoCs/tree/main/deark-CVE-2021-28855"}, {"source": "cve@mitre.org", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/jsummers/deark/commit/287f5ac31dfdc074669182f51ece637706070eeb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://fatihhcelik.github.io/posts/NULL-Pointer-Dereference-Deark/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/jsummers/deark/commit/287f5ac31dfdc074669182f51ece637706070eeb"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}