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CVE-2018-12249

25
FAUCET Score

CVE-2018-12249 describes a NULL pointer dereference vulnerability in mruby version 1.4.1, specifically within the class.c file due to improper handling of "class BasicObject." This flaw affects mruby and Debian Linux distributions utilizing the vulnerable mruby version. Rated with a CVSS score of 7.5 (HIGH), this vulnerability is remotely exploitable with low attack complexity, requiring no user interaction or privileges, and could lead to a denial of service. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.4.1CPE matchmatch criteria
cpe:2.3:a:mruby:mruby:1.4.1:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/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
3.1

Exploit Intelligence

EPSS Score
2.12%
Probability of exploitation in next 30 days
EPSS Percentile
79.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0212 is in the 64th 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/faa4eaf6803bd11669bc324b4c34e7162286bfa3
PatchThird Party Advisory
github.com / mruby/mruby/issues/4037
ExploitIssue TrackingThird Party Advisory
lists.debian.org / debian-lts-announce/2022/05/msg00006.html
Mailing ListThird Party Advisory