Security readout for executives and security teams
Plain-English summary
Deark can crash when it processes a specially crafted file. The business risk is interruption of workflows that automatically analyze or unpack untrusted files. The sources do not show code execution or confirmed active exploitation.
Executive priority
Treat as a targeted reliability and denial-of-service issue, not a confirmed breach indicator. Prioritize patching where Deark handles external files automatically.
Technical view
CVE-2021-28855 affects Deark before 1.5.8. A crafted input can trigger a NULL pointer dereference in dbuf_write in src/deark-dbuf.c, causing denial of service through process crash.
Likely exposure
Exposure is most likely where Deark before 1.5.8 processes untrusted files, such as forensic, malware analysis, archival, or file-inspection workflows. The source bundle does not identify downstream products.
Exploitation context
The CVE describes crafted-file exploitation. A public PoC repository is referenced, but KEV is false and the bundle provides no evidence of active exploitation in the wild.
Researcher notes
The available record lacks CVSS, CWE, and detailed affected CPEs. The fix is indicated by the upstream Deark commit and version boundary, but downstream packaging impact is not documented.
Mitigation direction
- Upgrade Deark to version 1.5.8 or later.
- Check the upstream commit and vendor guidance for the exact fix status.
- Restrict automated Deark processing of untrusted files until updated.
- Run Deark in a sandbox for untrusted-file workflows.
Validation and detection
- Inventory systems and pipelines running Deark.
- Confirm installed Deark versions are 1.5.8 or later.
- Review file-analysis jobs for untrusted input exposure.
- Check crash logs for Deark failures during file processing.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-28855 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.