Security readout for executives and security teams
Plain-English summary
mruby 1.4.1 can crash when certain object cloning behavior triggers a NULL pointer dereference. The business concern is service instability in software that embeds mruby, not confirmed system takeover. The source bundle provides no CVSS score, exploit activity, or named fixed release.
Executive priority
Treat this as a targeted dependency exposure review, not an emergency. Prioritize systems where mruby processes untrusted scripts or inputs, because a crash could affect availability. Escalate if a business-critical product embeds mruby 1.4.1.
Technical view
CVE-2018-12247 is a NULL pointer dereference in mrb_class related to specific .clone usage. The stated cause is mrb_obj_clone in kernel.c copying flags beyond MRB_FLAG_IS_FROZEN, including embedded-state flags. A referenced upstream commit exists, but the bundle lacks CPEs, CVSS, and release-level fix details.
Likely exposure
Exposure is most likely where mruby 1.4.1 is embedded in an application, appliance, scripting engine, or runtime component. The source bundle lists no concrete downstream products or CPEs, so inventory confirmation is required.
Exploitation context
The bundle does not show active exploitation, and KEV is false. Public references identify the issue and an upstream commit, but provide no evidence here of exploitation in the wild or weaponized use.
Researcher notes
Key missing data: CVSS, CWE mapping, CPEs, affected downstream products, and fixed release versions. The strongest source detail is the described clone-flag handling defect and the linked upstream commit. Avoid assuming remote reachability without product-specific context.
Mitigation direction
- Inventory applications and appliances that embed mruby.
- Identify any use of mruby 1.4.1 specifically.
- Review the upstream GitHub issue and commit for vendor-approved remediation.
- Use a supported mruby version or vendor backport when available.
- Monitor vendor advisories for embedded mruby dependencies.
Validation and detection
- Check software bills of materials for mruby references.
- Confirm runtime or package versions where mruby is present.
- Review dependency lockfiles and embedded third-party source trees.
- Validate vendor firmware or application release notes for this CVE.
- Track whether the referenced upstream commit is included.
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.
CVE-2018-12247 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/mruby/mruby/issues/4036CVE reference · x_refsource_MISC
- https://github.com/mruby/mruby/commit/55edae0226409de25e59922807cb09acb45731a2CVE 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.