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CVE Record

CVE-2021-46310: An issue was discovered IW44Image.cpp in djvulibre 3.5.28 in allows attackers to cause a denial of service...

An issue was discovered IW44Image.cpp in djvulibre 3.5.28 in allows attackers to cause a denial of service via divide by zero.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-46310 is a djvulibre issue where processing DjVu image data can hit a divide-by-zero condition and crash the software. The documented impact is denial of service, not data theft or code execution. Business urgency depends on whether DjVu files enter production document, email, upload, preview, or conversion workflows.

Executive priority

Prioritize if DjVu files can reach customer-facing or automated processing systems. For endpoints or rarely used local viewers, handle through normal patch cycles. The main business risk is service disruption from malformed document handling.

Technical view

The source record identifies IW44Image.cpp in djvulibre 3.5.28 as vulnerable to divide by zero, causing denial of service. Public references include the upstream SourceForge bug and Fedora and Debian advisories. The bundle does not provide CVSS, CWE, detailed affected CPEs, or proof of active exploitation.

Likely exposure

Exposure is most likely where djvulibre or linked DjVu parsing libraries process untrusted files, especially document viewers, converters, indexers, upload scanners, and preview services. The bundle only names djvulibre 3.5.28, so exact distro package exposure should be confirmed against vendor advisories.

Exploitation context

The provided sources support a denial-of-service condition through DjVu parsing. KEV is false, and the bundle contains no cited evidence of active exploitation. Treat attacker control of DjVu input as the key risk condition.

Researcher notes

Evidence is thin: no CVSS, CWE, CPE, or exploit confirmation is present in the bundle. The strongest facts are the affected component, divide-by-zero denial of service, upstream bug reference, and downstream Fedora/Debian advisories. Avoid expanding impact beyond availability without new evidence.

Mitigation direction

  • Check Fedora and Debian advisories for fixed package versions.
  • Update djvulibre packages through supported vendor repositories.
  • Restrict untrusted DjVu processing in exposed upload or preview paths.
  • Add isolation or crash recovery around document conversion services.
  • Monitor upstream and distribution guidance for affected-version details.

Validation and detection

  • Inventory systems with djvulibre or libdjvulibre installed.
  • Identify applications that accept, preview, index, or convert DjVu files.
  • Compare installed package versions with Fedora and Debian advisory versions.
  • Confirm document-processing services restart cleanly after parser crashes.
  • Review recent crash logs for djvulibre-related failures.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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.

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CVE-2021-46310 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
0Timeline events
0ADP providers
8Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.