A vulnerability was found in Radare2 in versions prior to 5.6.2, 5.6.0, 5.5.4 and 5.5.2.

published 2022-02-24 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-33924

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.1%; EPSS 1.1% chance of exploitation in 30 days, percentile 65%
public exploits: 0; none known

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.

Patch / fix

distros 2

alpine arch linux

radare2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +4 more 5.5.2-r0

alpine advisories ALPINE-CVE-2021-4021

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

radare2 Arch Linux 5.5.2-1

arch linux advisories AVG-2583

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-4021 updated 2026-03-27 cvss 3.3

radare2: uncontrolled resource consumption via specially crafted ELF64 binary for MIPS architecture

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.07% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/radareorg/radare2/issues/19436 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

n/a radare2

Classification

Weakness

CWE-400 Uncontrolled Resource Consumption
CWE-834 Excessive Iteration

References

github.com /radareorg/radare2/issues/19436
exploit, issue-tracking, third-party-advisory

Sources

CVE List CVE-2021-4021
NVD CVE-2021-4021

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary