Security readout for executives and security teams
Plain-English summary
CVE-2021-39539 is a denial-of-service issue in pdftools through 20200714. A malicious or malformed PDF can trigger a crash through a NULL pointer dereference. The business risk is service disruption where pdftools handles untrusted PDFs, not data theft based on the provided sources.
Executive priority
Prioritize if pdftools is used in customer-facing PDF processing or critical document workflows. Otherwise, handle as a targeted dependency review because the known impact is denial of service and remediation details are limited.
Technical view
The CVE identifies a NULL pointer dereference in node::BDCNode::~BDCNode() in bdcnode.cpp. The published impact is denial of service. The source bundle does not provide CVSS, CWE, confirmed fixed versions, affected CPEs, or evidence of exploitation in the wild.
Likely exposure
Exposure is most likely where pdftools through 20200714 is embedded in applications, batch jobs, or upload pipelines that parse PDFs from users, customers, email, or other untrusted sources.
Exploitation context
The provided sources say the issue allows denial of service. There is no KEV listing and no cited evidence of active exploitation. Treat exploitability details as incomplete unless confirmed through vendor or project guidance.
Researcher notes
The record is sparse: no CVSS, CWE, CPEs, patch reference, or exploit status beyond a GitHub issue. Validation should focus on confirming actual pdftools use and whether untrusted PDF parsing can reach the affected destructor path.
Mitigation direction
- Inventory applications and services using pdftools through 20200714.
- Check the project issue and vendor guidance for fixed versions or patches.
- Restrict pdftools processing of untrusted PDFs until remediation is confirmed.
- Run PDF parsing in isolated workers with restart and resource controls.
- Consider replacing or upgrading pdftools if no maintained fix is available.
Validation and detection
- Confirm whether pdftools is present in source, containers, or build manifests.
- Verify deployed pdftools version or snapshot date is after 20200714.
- Identify workflows where pdftools processes externally supplied PDFs.
- Review crash logs for failures around BDCNode destruction or PDF parsing.
- Track the GitHub issue for remediation details before closing exposure.
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-2021-39539 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/6CVE 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.