CVE-2018-20457

Name: CVE-2018-20457
Creator: NVD / NIST
Published: 2018-12-25T19:29:00.367+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.86%

Last modified Jun 17, 2026

CVE-2018-20457 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. In radare2 through 3.1.3, the assemble function inside libr/asm/p/asm_arm_cs.c allows attackers to cause a denial-of-service (application crash via an r_num_calc out-of-bounds read) by crafting an arm assembly input because a loop uses an incorrect index in armass.c and certain length validation is missing in armass64.c, a related issue to CVE-2018-20459.. EPSS estimates a 0.86% chance of exploitation in the next 30 days.

Description

In radare2 through 3.1.3, the assemble function inside libr/asm/p/asm_arm_cs.c allows attackers to cause a denial-of-service (application crash via an r_num_calc out-of-bounds read) by crafting an arm assembly input because a loop uses an incorrect index in armass.c and certain length validation is missing in armass64.c, a related issue to CVE-2018-20459.

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS Probability

0.86%

54.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Radare	Radare2	<= 3.1.3

References

https://github.com/radare/radare2/issues/12417Patch, Third Party Advisory
https://github.com/radareorg/radare2/commit/e5c14c167b0dcf0a53d76bd50bacbbcc0dfc1ae7Patch, Vendor Advisory
https://github.com/radare/radare2/issues/12417Patch, Third Party Advisory
https://github.com/radareorg/radare2/commit/e5c14c167b0dcf0a53d76bd50bacbbcc0dfc1ae7Patch, Vendor Advisory

Timeline

Published: Dec 25, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-20457?

How severe is CVE-2018-20457?

CVE-2018-20457 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.86% probability of exploitation in the next 30 days.

How do I fix CVE-2018-20457?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-20457?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST