Security readout for executives and security teams
Plain-English summary
A vulnerable Brava! Desktop user could expose limited sensitive information after opening a malicious PDF or visiting a malicious page. The issue is user-triggered and rated low by CVSS, but it matters where Brava handles untrusted documents or sensitive files.
Executive priority
Treat this as a low-severity, targeted desktop exposure. It does not justify emergency action absent additional chaining risk, but affected document-handling users should be found and moved to vendor-supported guidance promptly.
Technical view
CVE-2021-31506 is a CWE-125 out-of-bounds read in OpenText Brava! Desktop Build 16.6.4.55 PDF parsing. Improper validation of user-supplied PDF data can read past an allocated data structure. Sources say it may be chained with other vulnerabilities for code execution in the current process.
Likely exposure
Exposure is likely limited to endpoints running OpenText Brava! Desktop Build 16.6.4.55, especially users who open PDFs from email, portals, file shares, or external parties. The provided sources do not identify other affected versions or products.
Exploitation context
User interaction is required. The target must open a malicious file or visit a malicious page. The source bundle does not show CISA KEV listing or other evidence of active exploitation.
Researcher notes
The bundle names only Build 16.6.4.55 and cites ZDI-CAN-13674. The CVSS vector indicates local attack vector with required user interaction, while the description frames remote attackers delivering content. No proof-of-exploit or patch details are included in the supplied sources.
Mitigation direction
- Inventory Brava! Desktop installations and identify Build 16.6.4.55.
- Check OpenText support guidance for a fixed or supported replacement build.
- Limit opening of untrusted PDFs in affected Brava! Desktop installations.
- Use endpoint, email, and web controls to block suspicious document delivery.
- Prioritize remediation for users handling external or sensitive documents.
Validation and detection
- Confirm installed Brava! Desktop build numbers on managed endpoints.
- Identify users or teams processing externally supplied PDFs.
- Review email and web security alerts involving suspicious PDFs.
- Check vendor guidance before declaring remediation complete.
- Document any compensating controls for affected systems awaiting update.
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-2021-31506 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.zerodayinitiative.com/advisories/ZDI-21-647/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.