Security readout for executives and security teams
Plain-English summary
Binary Ninja 2.3.2660 has a file-parsing flaw that can let an attacker run code if a user opens a malicious BNDB file or visits a malicious page. This mainly threatens reverse-engineering workstations, not public servers. The bundle shows no CISA KEV listing or active exploitation evidence.
Executive priority
Treat this as a high-priority workstation risk for teams using Binary Ninja. It is not described as internet-wormable, but compromise of a reverse-engineering workstation can expose sensitive samples, tooling, credentials, and research data.
Technical view
The flaw is in BNDB parsing in Vector 35 Binary Ninja 2.3.2660 Build ID 88f343c3. The CVE describes missing validation of an object before use, mapped to CWE-416, allowing code execution in the current process after user interaction. CVSS is 7.8 high with local attack vector and required user interaction.
Likely exposure
Exposure is likely limited to systems running the affected Binary Ninja build, especially analyst workstations that open untrusted BNDB files or browse attacker-controlled content during research. General server exposure is unlikely based on the provided CVSS vector and description.
Exploitation context
Successful exploitation requires user interaction: the target must visit a malicious page or open a malicious file. The provided bundle does not show CISA KEV status or any confirmed in-the-wild exploitation.
Researcher notes
The source bundle identifies BNDB parsing, object validation failure, CWE-416, and ZDI-CAN-13670. It does not provide enough detail to determine exploit reliability, exact vulnerable code paths, or all fixed versions beyond consulting Vector 35 release guidance.
Mitigation direction
- Identify and retire Binary Ninja 2.3.2660 Build ID 88f343c3.
- Upgrade Binary Ninja using Vector 35 vendor guidance and release notes.
- Avoid opening untrusted BNDB files on affected versions.
- Use isolated analysis environments for untrusted reverse-engineering samples.
- Monitor vendor advisories for any additional affected builds or fixes.
Validation and detection
- Inventory Binary Ninja installations and record exact versions and build IDs.
- Check whether any system runs 2.3.2660 Build ID 88f343c3.
- Review analyst workflows for untrusted BNDB file handling.
- Confirm upgraded systems no longer report the affected build.
- Look for suspicious Binary Ninja crashes or child processes in endpoint telemetry.
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-416: 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-2021-31516 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://binary.ninja/2021/06/03/2.4-release.html#security-advisoriesCVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-21-677/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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.