Security readout for executives and security teams
Plain-English summary
CVE-2021-31487 is a code execution flaw in OpenText Brava! Desktop 16.6.3.84. A victim must open a malicious DWF file or visit a malicious page. Successful exploitation could let an attacker run code with the user’s permissions, affecting confidentiality, integrity, and availability.
Executive priority
Treat as high priority where Brava! Desktop is deployed in document intake workflows. The risk is not network-wormable, but a single malicious file could compromise a user workstation and downstream data access.
Technical view
The flaw is a CWE-787 out-of-bounds write in DWF file parsing. The parser does not properly validate user-supplied data, allowing a write past an allocated buffer. CVSS 3.0 is 7.8 with user interaction required and no privileges required.
Likely exposure
Exposure is most likely on endpoints running OpenText Brava! Desktop 16.6.3.84, especially in teams that review DWF design, engineering, or document files from external sources.
Exploitation context
The source bundle supports remote attacker inducement through a malicious page or file, but exploitation requires user interaction. KEV is false, and no supplied source reports active exploitation.
Researcher notes
ZDI tracks this as ZDI-21-627 and notes the original case as ZDI-CAN-12715. The provided evidence identifies only OpenText Brava! Desktop 16.6.3.84 as affected and does not name a fixed version or patch.
Mitigation direction
- Inventory endpoints for OpenText Brava! Desktop 16.6.3.84.
- Check OpenText guidance for fixed versions or vendor-approved remediation.
- Limit opening DWF files from untrusted sources until remediated.
- Use endpoint protection and application controls for high-risk document workflows.
- Educate users handling external DWF files about this risk.
Validation and detection
- Confirm installed Brava! Desktop versions on managed endpoints.
- Identify users or business units processing DWF files externally.
- Review EDR telemetry for suspicious Brava! Desktop child processes or crashes.
- Verify whether OpenText has published remediation for this specific version.
- Document compensating controls where upgrade status is unknown.
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-787: 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-2021-31487 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
- https://www.zerodayinitiative.com/advisories/ZDI-21-627/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 Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.