Buffer overflow in Jerryscript

CVE-2020-23321

There is a heap-buffer-overflow at lit-strings.c:431 in lit_read_code_unit_from_utf8 in JerryScript 2.2.0.

Vulnerability class: Buffer Overflow

EPSS: 0.013 (67.8th 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

Jerryscript — versions 2.2.0
N/a — versions n/a

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

n0-traces/cve_

References

cve@mitre.org (x_refsource_CONFIRM, Exploit, Patch, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-23321?: CVE-2020-23321 is a critical-severity vulnerability in Jerryscript, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-06-10.
How severe is CVE-2020-23321?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-23321 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.