Buffer overflow in Mruby

CVE-2020-6839

In mruby 2.1.0, there is a stack-based buffer overflow in mrb_str_len_to_dbl in string.c.

Vulnerability class: Buffer Overflow

EPSS: 0.014 (68.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mruby — versions 2.1.0
N/a — versions n/a

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2020-6839?: CVE-2020-6839 is a critical-severity vulnerability in Mruby, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2020-01-11.
How severe is CVE-2020-6839?: Critical severity. CVSS v3 base score is 9.8 out of 10.