What is CVE-2018-20456?

CVE-2018-20456 is a medium-severity vulnerability in Radare Radare2, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2018-12-25.

How severe is CVE-2018-20456?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Out-of-bounds Read in Radare Radare2

CVE-2018-20456

In radare2 prior to 3.1.1, the parseOperand function inside libr/asm/p/asm_x86_nz.c may allow attackers to cause a denial of service (application crash in libr/util/strbuf.c via a stack-based buffer over-read) by crafting an input file, a related issue to CVE-2018-20455.

Vulnerability class: Buffer Overflow

Published 2018-12-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.010 (61.6th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.6% 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

Radare Radare2

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

github.com/radare/radare2/commit/9b46d38dd3c4de6048a488b655c7319f845af185 (Patch, Third Party Advisory)
github.com/radare/radare2/issues/12372 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-20456?: CVE-2018-20456 is a medium-severity vulnerability in Radare Radare2, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2018-12-25.
How severe is CVE-2018-20456?: Medium severity. CVSS v3 base score is 5.5 out of 10.