Security readout for executives and security teams
Plain-English summary
A crafted PDF-related file or web page can make Foxit PDF Reader run attacker-controlled code if a user opens it. The issue affects Foxit PDF Reader 11.0.0.49893 and requires user interaction, so risk centers on employee endpoints and phishing-style delivery.
Executive priority
Treat as high priority for endpoint patch management, especially in email-heavy or document-heavy environments. The issue can lead to full code execution under the user's context, but the available sources do not show active exploitation.
Technical view
ZDI reports a flaw in Foxit PDF Reader's handling of the delay property. The software fails to validate that an object exists before operating on it, mapped to CWE-416, allowing code execution in the current process after a malicious file or page is opened.
Likely exposure
Exposure is likely limited to systems running Foxit PDF Reader 11.0.0.49893, especially user workstations that handle untrusted PDFs or browser-delivered documents. The bundle does not identify other affected Foxit versions or products.
Exploitation context
The sources describe remote attacker-controlled code execution, but exploitation requires the target to open a malicious file or visit a malicious page. CISA KEV is false in the bundle, and no cited source states active exploitation.
Researcher notes
Evidence is strongest for Foxit PDF Reader 11.0.0.49893 and ZDI-CAN-13928. The bundle names the vulnerable behavior but does not provide patch version details, exploit availability, or broader affected-version ranges.
Mitigation direction
- Inventory Foxit PDF Reader installations and identify version 11.0.0.49893.
- Review Foxit security bulletins for the vendor-approved fixed version or workaround.
- Prioritize updating affected user endpoints that process external PDFs.
- Restrict untrusted PDF handling where rapid updating is not possible.
- Use email and web controls to reduce malicious document delivery.
Validation and detection
- Confirm installed Foxit PDF Reader versions on managed endpoints.
- Check whether affected hosts have received Foxit security updates.
- Review EDR alerts involving Foxit Reader launching unusual child processes.
- Validate phishing defenses for PDF attachments and document links.
- Document any systems that cannot be updated promptly.
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-2021-34832 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
- https://www.foxit.com/support/security-bulletins.htmlCVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-21-914/CVE 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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.