CVE-2018-12247

FAUCET Score

CVE-2018-12247 describes a NULL pointer dereference vulnerability in mruby version 1.4.1, specifically within the mrb_class function due to improper flag copying during object cloning. This flaw allows for a denial-of-service attack, as indicated by its CVSS score of 7.5 (High) with an availability impact. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		1.4.1CPE matchmatch criteria	cpe:2.3:a:mruby:mruby:1.4.1:::::::*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

Exploitability Score

3.9

Impact Score

3.6

CvssVersion

3.0

Exploit Intelligence

EPSS Score

1.55%

Probability of exploitation in next 30 days

EPSS Percentile

72.5%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0155 is in the 54th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference

View patch

References

github.com / mruby/mruby/commit/55edae0226409de25e59922807cb09acb45731a2

PatchThird Party Advisory

github.com / mruby/mruby/issues/4036

Issue TrackingThird Party Advisory