Security readout for executives and security teams
Plain-English summary
CVE-2021-34962 is a high-severity flaw in Foxit PDF Editor 11.0.0.49893. A user opening a malicious file or visiting a malicious page could allow attacker-controlled code to run as the PDF Editor process.
Executive priority
Treat this as a timely endpoint remediation item, not an emergency internet-facing server issue. Business risk comes from malicious documents reaching staff who use the affected Foxit PDF Editor version.
Technical view
The flaw is a CWE-416 use-after-free in Caret Annotation handling. The issue stems from operations on an Annotation object without validating that the object still exists, enabling code execution in the current process after user interaction.
Likely exposure
Exposure is most likely on endpoints running Foxit PDF Editor 11.0.0.49893, especially users who handle externally supplied PDFs or web content. The source bundle does not identify other affected versions or products.
Exploitation context
The sources describe remote code execution requiring user interaction. The CVE is not listed as KEV in the provided bundle, and no cited source states active exploitation.
Researcher notes
Evidence supports a use-after-free RCE in Annotation object handling, ZDI-CAN-14364. Public bundle details are limited: no exploit evidence, no IoCs, and no explicit fixed version are provided here.
Mitigation direction
- Inventory Foxit PDF Editor installations and identify version 11.0.0.49893.
- Check Foxit security bulletins for fixed versions or official mitigation guidance.
- Prioritize updates for users who open external PDF files.
- Limit handling of untrusted PDFs on affected endpoints where practical.
- Use endpoint controls to reduce impact from malicious document execution.
Validation and detection
- Confirm whether Foxit PDF Editor 11.0.0.49893 is installed.
- Review vendor guidance for the exact fixed or unaffected build.
- Verify affected endpoints were updated or otherwise controlled.
- Check exposure of users receiving external PDF attachments or links.
- Look for unexplained Foxit PDF Editor crashes, while noting no IoCs were provided.
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.
CWE-416: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-34962 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
- High
- CVSS
- 7.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.8HighVector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- ZDI-21-1193CVE reference · x_research-advisory
- vendor-provided URLCVE reference · vendor-advisory
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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.