CVE-2018-12247

HIGHNVD 7.57.5—Trending — 3 sources updated this week

7.5

An issue was discovered in mruby 1.4.1. There is a NULL pointer dereference in mrb_class, related to certain .clone usage, because mrb_obj_clone in kernel.c copies flags other than the MRB_FLAG_IS_FROZEN flag (e.g., the embedded flag).

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 51.1%
KEV: Not listed

Published

June 12, 2018

Last Modified

November 21, 2024

References (4)

cve@mitrehttps://github.com/mruby/mruby/commit/55edae0226409de25e59922807cb09acb45731a2
cve@mitrehttps://github.com/mruby/mruby/issues/4036
af854a3a-2127-422b-91ae-364da2661108https://github.com/mruby/mruby/commit/55edae0226409de25e59922807cb09acb45731a2
af854a3a-2127-422b-91ae-364da2661108https://github.com/mruby/mruby/issues/4036

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-476NULL Pointer Dereference

Data Freshness Timeline

(refreshed 12× in last 7d / 19× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:49 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:28 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:41 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 06:44 UTCEG score recompute
2026-05-28 06:44 UTCGHSA enrichment
2026-05-27 13:38 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 04:46 UTCOSV refresh

Frequently asked(5)

What is CVE-2018-12247?

CVE-2018-12247 is a high vulnerability published on June 12, 2018. An issue was discovered in mruby 1.4.1. There is a NULL pointer dereference in mrbclass, related to certain .clone usage, because mrbobjclone in kernel.c copies flags other than the MRBFLAGISFROZEN flag (e.g., the embedded flag).

When was CVE-2018-12247 disclosed?

CVE-2018-12247 was first published in the National Vulnerability Database on June 12, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2018-12247 actively exploited?

CVE-2018-12247 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 51.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2018-12247?

CVE-2018-12247 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2018-12247?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-12247, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2018-12247

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2018-12247?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same CWE)