Security readout for executives and security teams
Plain-English summary
This is a memory-safety flaw in Foxit PDF Editor that could let an attacker run code if a user opens a malicious PDF or visits a malicious page. The bundle identifies Foxit PDF Editor 11.0.0.49893 as affected. No provided source shows active exploitation or CISA KEV listing.
Executive priority
Treat this as a high-priority endpoint remediation issue, especially for users handling external PDFs. The business risk is code execution after user interaction, not unauthenticated internet compromise. Prioritize inventory and vendor-guided updates over emergency incident response unless local telemetry suggests targeting.
Technical view
CVE-2021-34965 is a CWE-416 use-after-free in handling Annotation objects, specifically squiggly annotations. The flaw is described as missing validation that an object exists before operations are performed on it. Successful exploitation can execute code in the current process context and requires user interaction.
Likely exposure
Exposure is likely limited to endpoints running Foxit PDF Editor, especially version 11.0.0.49893, where users open PDFs from email, downloads, web content, or shared drives. Servers are unlikely to be directly exposed unless they process documents with the affected desktop application.
Exploitation context
The cited description says exploitation requires the target to open a malicious file or visit a malicious page. The CVSS vector is local with required user interaction. The provided bundle does not show public exploitation, exploit maturity, or KEV inclusion.
Researcher notes
The record attributes the issue to ZDI-CAN-14361 and describes object-lifetime validation failure in Annotation handling. Evidence is incomplete on fixed versions, exploit availability, and real-world exploitation. Do not infer broader Foxit product impact beyond Foxit PDF Editor 11.0.0.49893 from this bundle.
Mitigation direction
- Inventory Foxit PDF Editor installations and identify version 11.0.0.49893.
- Review Foxit security bulletins for the vendor-approved fixed release and guidance.
- Prioritize updating affected endpoints according to Foxit guidance.
- Limit opening untrusted PDFs with affected Foxit versions until remediated.
- Use email and web filtering to reduce delivery of suspicious PDFs.
Validation and detection
- Confirm installed Foxit PDF Editor versions on managed endpoints.
- Flag version 11.0.0.49893 as affected based on the source bundle.
- Verify remediation against Foxit security bulletin guidance before closure.
- Review endpoint telemetry for suspicious Foxit crashes around PDF handling.
- Check whether high-risk users receive or open external PDF files.
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-2021-34965 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-21-1196CVE 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.