Security readout for executives and security teams
Plain-English summary
This is a low-severity information disclosure issue in Foxit PDF Reader. A user would need to open a malicious file or visit a malicious page. By itself, the flaw exposes limited sensitive information, but ZDI notes it could support code execution when combined with other vulnerabilities.
Executive priority
Treat this as routine endpoint hygiene unless Foxit Reader 11.0.1.49938 is widely deployed or users handle untrusted PDFs at scale. The main business concern is its potential value in a vulnerability chain.
Technical view
CVE-2021-34970 is a CWE-134 externally controlled format string flaw in Foxit PDF Reader's print method. The listed affected version is 11.0.1.49938. CVSS v3.0 is 3.3, with user interaction required and low confidentiality impact. The provided sources do not identify a fixed version.
Likely exposure
Exposure is most likely on endpoints running Foxit PDF Reader 11.0.1.49938, especially where users open PDFs from email, browsers, or external sources. No other affected products or versions are identified in the supplied bundle.
Exploitation context
The bundle says exploitation requires user interaction through a malicious page or file. It is not listed as CISA KEV, and the supplied sources do not support active exploitation claims. ZDI states attackers could chain it with other vulnerabilities for code execution.
Researcher notes
Evidence is limited to CVE/ZDI/vendor references in the supplied bundle. The key technical point is format-string misuse in the print method. Patch details are not present, so remediation should be tied to Foxit's bulletin rather than inferred.
Mitigation direction
- Check Foxit security bulletins for vendor fix guidance and fixed versions.
- Update or remove Foxit PDF Reader 11.0.1.49938 from managed endpoints.
- Limit opening PDFs from untrusted sources until systems are remediated.
- Use endpoint controls to reduce exposure to malicious files and pages.
Validation and detection
- Inventory endpoints for Foxit PDF Reader version 11.0.1.49938.
- Confirm remediation status against Foxit's security bulletin guidance.
- Review email and web controls for untrusted PDF handling.
- Do not validate by opening suspicious files on production systems.
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-134: 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-2021-34970 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
- Low
- CVSS
- 3.3 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
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:L/I:N/A:N1.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
3.3LowVector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- ZDI-21-1201CVE 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 of Externally-Controlled Format String
Use of Externally-Controlled Format String represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.