What is CVE-2022-0240?

CVE-2022-0240 is a high-severity vulnerability in Mruby, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2022-01-17.

How severe is CVE-2022-0240?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2022-0240 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

NULL pointer dereference in Mruby

CVE-2022-0240

mruby is vulnerable to NULL Pointer Dereference

Published 2022-01-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.010 (60.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 60.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Mruby
Mruby Mruby/mruby — versions unspecified

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

Public proof-of-concept exploits

SEC-bench/SEC-bench

References

huntr.dev/bounties/5857eced-aad9-417d-864e-0bdf17226cbb (Exploit, Third Party Advisory)
github.com/mruby/mruby/commit/31fa3304049fc406a201a72293cce140f0557dca (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2022-0240?: CVE-2022-0240 is a high-severity vulnerability in Mruby, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2022-01-17.
How severe is CVE-2022-0240?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2022-0240 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.