Security readout for executives and security teams
Plain-English summary
CVE-2023-33866 is a high-severity memory safety flaw in Foxit PDF Reader. A malicious PDF can cause code execution when a user opens it. Exposure is mainly on workstations where Foxit Reader 12.1.2.15332 is installed, especially users who receive PDFs from outside parties.
Executive priority
Treat this as a high-priority endpoint remediation issue. It can lead to full compromise through normal document-handling workflows, but the sources indicate user interaction is required and do not confirm active exploitation.
Technical view
The issue is a CWE-416 use-after-free in Foxit Reader’s JavaScript engine. Premature deletion of page-associated objects can allow reuse of freed memory, leading to arbitrary code execution. The CVSS 3.1 score is 8.8, with network attack vector, low complexity, no privileges required, and user interaction required.
Likely exposure
Organizations are exposed where Foxit Reader 12.1.2.15332 is installed on user endpoints. Risk increases for users handling untrusted PDFs, email attachments, downloads, or browser-delivered PDFs when the Foxit browser plugin extension is enabled.
Exploitation context
The provided sources do not show CISA KEV listing or confirmed active exploitation. Exploitation requires tricking a user into opening a malicious PDF, or visiting a malicious site if the Foxit browser plugin extension is enabled.
Researcher notes
Focus validation on the exact affected version and browser plugin exposure. The sources identify the bug class and impact but do not provide a fixed version in the supplied bundle, so remediation should be tied to current Foxit advisory guidance.
Mitigation direction
- Inventory endpoints for Foxit Reader version 12.1.2.15332.
- Check Foxit guidance for fixed versions or vendor-recommended mitigations.
- Prioritize updating or replacing vulnerable Foxit Reader installations.
- Disable the Foxit browser plugin extension where not required.
- Restrict handling of untrusted PDFs until remediation is complete.
Validation and detection
- Confirm installed Foxit Reader versions across managed endpoints.
- Identify users or systems with the Foxit browser plugin extension enabled.
- Review endpoint telemetry for suspicious Foxit Reader crashes or child processes.
- Verify remediation by rescanning for version 12.1.2.15332.
- Document compensating controls for systems that cannot be updated quickly.
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-2023-33866 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
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/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:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
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.