CVE-2021-4021

HIGHNVD 7.57.5—

7.5

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.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 63.1%
KEV: Not listed

Published

February 24, 2022

Last Modified

November 21, 2024

References (2)

patrick@puiterwijkhttps://github.com/radareorg/radare2/issues/19436
af854a3a-2127-422b-91ae-364da2661108https://github.com/radareorg/radare2/issues/19436

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 8× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 02:31 UTCEG score recompute
2026-05-26 02:31 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2021-4021?

CVE-2021-4021 is a high vulnerability published on February 24, 2022. 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.

When was CVE-2021-4021 disclosed?

CVE-2021-4021 was first published in the National Vulnerability Database on February 24, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-4021 actively exploited?

CVE-2021-4021 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 63.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-4021?

CVE-2021-4021 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2021-4021?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-4021, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-4021

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Is Your Infrastructure Affected by CVE-2021-4021?

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CVE-2021-4021

📅 Published

🔄 Last Modified

🔗 References (2)