Security readout for executives and security teams
Plain-English summary
This is a Foxit Reader PDF parsing flaw. An attacker would need a user to open a malicious PDF or visit a malicious page. The disclosed impact is limited information exposure, but the advisory says it could help another vulnerability achieve code execution.
Executive priority
Handle through normal endpoint patch management unless Foxit Reader is broadly deployed in high-risk user groups. Escalate if phishing exposure is high or the version is widespread.
Technical view
Foxit Reader 10.1.1.37576 mishandles U3D objects embedded in PDFs. Missing validation can cause an out-of-bounds read, mapped to CWE-125. CVSS is 3.3 low, with required user interaction and confidentiality-only impact in the base score.
Likely exposure
Exposure is mainly desktops or virtual desktops running Foxit Reader 10.1.1.37576 where users open external PDFs or browse attacker-controlled content.
Exploitation context
The bundle does not show CISA KEV listing or cited active exploitation. Exploitation requires user interaction and appears most useful as part of a chained attack rather than standalone compromise.
Researcher notes
ZDI identifies the flaw as ZDI-CAN-12955 and describes U3D object parsing as the vulnerable area. The source bundle does not provide exploit details, fixed version text, or evidence of exploitation in the wild.
Mitigation direction
- Identify and remove or upgrade Foxit Reader 10.1.1.37576 per Foxit guidance.
- Check Foxit security bulletins for the supported fixed version or workaround.
- Limit opening PDFs from untrusted sources, especially files containing 3D/U3D content.
- Use email and web filtering to reduce delivery of suspicious PDF files.
Validation and detection
- Inventory endpoints for Foxit Reader 10.1.1.37576.
- Confirm endpoint management shows Foxit Reader no longer at the affected version.
- Review PDF reader defaults on high-risk user workstations.
- Check CISA KEV status before emergency escalation decisions.
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-125: 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-2021-31471 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
- https://www.foxitsoftware.com/support/security-bulletins.phpCVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-21-528/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.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.