Security readout for executives and security teams
Plain-English summary
CVE-2021-31515 affects Vector 35 Binary Ninja 2.3.2660. A malicious BNDB file or page could trigger code execution when opened by a user. This is high severity, but the source bundle does not show active exploitation or KEV listing.
Executive priority
Prioritize remediation for teams that use Binary Ninja on untrusted files. The business risk is workstation compromise during analysis, not broad internet-facing exposure.
Technical view
The flaw is in BNDB file parsing. Insufficient validation of user-supplied data can cause a read past the end of an allocated data structure, classified as CWE-125. ZDI states attackers can execute code in the current process context.
Likely exposure
Exposure is likely limited to systems running Vector 35 Binary Ninja 2.3.2660 build 88f343c3, especially analyst workstations that open BNDB files from third parties or untrusted sources.
Exploitation context
User interaction is required: the target must visit a malicious page or open a malicious file. The bundle marks KEV as false and provides no cited evidence of active exploitation.
Researcher notes
The public bundle identifies the affected build and parser class but does not include exploit artifacts, detailed root-cause internals, or confirmed fixed-version text. Treat remediation confirmation as vendor-advisory dependent.
Mitigation direction
- Identify any Binary Ninja 2.3.2660 build 88f343c3 installations.
- Check Vector 35 guidance and update affected installations accordingly.
- Avoid opening untrusted BNDB files or links in affected versions.
- Use isolated analysis workstations for untrusted reverse-engineering inputs.
Validation and detection
- Inventory Binary Ninja versions and build IDs across analyst systems.
- Confirm whether version 2.3.2660 build 88f343c3 is present.
- Review file-handling workflows for untrusted BNDB inputs.
- Check vendor advisory records for the applicable fixed release.
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-2021-31515 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-21-678/CVE reference · x_refsource_MISC
- https://binary.ninja/2021/06/03/2.4-release.html#security-advisoriesCVE 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.