Security readout for executives and security teams
Plain-English summary
CVE-2021-39541 is a denial-of-service issue in pdftools through 20200714. A malformed or malicious PDF could crash the tool when it analyzes PDF cross-reference data. This is mainly an availability risk, not evidence of data theft or code execution.
Executive priority
Treat as a targeted availability risk. Prioritize if pdftools is used in customer-facing or automated PDF processing. It is not currently supported by source evidence as a critical breach risk.
Technical view
The CVE reports a NULL pointer dereference in Analyze::AnalyzeXref() in analyze.cpp. The documented impact is denial of service. The source bundle does not provide CVSS, CWE, detailed affected CPEs, patch status, or a confirmed fixed version.
Likely exposure
Exposure is most likely where pdftools through 20200714 processes PDFs from users, customers, email, web uploads, or automated document pipelines. Local-only use with trusted PDFs is lower urgency.
Exploitation context
The CVE is not listed as KEV, and the provided sources do not state active exploitation. The issue requires a PDF processing path that reaches Analyze::AnalyzeXref(); exact trigger details are not provided here.
Researcher notes
Key gaps are missing CVSS, CWE, CPEs, exploit maturity, and fixed-version data. Analysis should stay anchored to the GitHub issue and CVE record until upstream confirms remediation details.
Mitigation direction
- Identify any pdftools deployments and record installed versions.
- Avoid processing untrusted PDFs with affected pdftools versions.
- Check the upstream issue and project guidance for fixes or safer versions.
- Run PDF processing in isolated, resource-limited environments.
- Add monitoring for repeated pdftools crashes or failed PDF analysis jobs.
Validation and detection
- Search application inventories for pdftools through 20200714.
- Map PDF ingestion workflows that call pdftools analysis functions.
- Review logs for crashes during PDF cross-reference analysis.
- Confirm whether internet-facing or customer-supplied PDFs reach pdftools.
- Verify vendor or project guidance before declaring remediation complete.
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-2021-39541 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
- CVE List V5 sourceCVE List V5
- https://github.com/leonhad/pdftools/issues/3CVE reference · x_refsource_MISC
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.