CVE-2021-4021

Name: CVE-2021-4021
Creator: NVD / NIST
Published: 2022-02-24T19:15:09.533+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.03%

Last modified Jun 17, 2026

CVE-2021-4021 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability was found in Radare2 in versions prior to 5.6.2, 5.6.0, 5.5.4 and 5.5.2. Mapping a huge section filled with zeros of an ELF64 binary for MIPS architecture can lead to uncontrolled resource consumption and DoS.. EPSS estimates a 1.03% chance of exploitation in the next 30 days.

Description

A vulnerability was found in Radare2 in versions prior to 5.6.2, 5.6.0, 5.5.4 and 5.5.2. Mapping a huge section filled with zeros of an ELF64 binary for MIPS architecture can lead to uncontrolled resource consumption and DoS.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.03%

59.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Radare	Radare2	<= 5.5.0

References

https://github.com/radareorg/radare2/issues/19436Exploit, Issue Tracking, Third Party Advisory
https://github.com/radareorg/radare2/issues/19436Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Feb 24, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4021?

How severe is CVE-2021-4021?

CVE-2021-4021 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.03% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4021?

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-2021-4021?

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

Scan your code now

Source: NVD / NIST