Is CVE-2021-4021 in the CISA KEV catalog?

No. CVE-2021-4021 is not currently on the CISA Known Exploited Vulnerabilities list.

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

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

What is the EPSS score for CVE-2021-4021?

CVE-2021-4021 has an EPSS score of 1.03% (59th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-4021?

Upgrade radare2 on debian unstable to 5.9.0+dfsg-1 or later.

CVE & CISA-KEV Catalog

CVE-2021-4021

HIGH

7.5

CVSS v3

NVD

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.

CWE-400Resource Exhaustion CWE-834

How to fix

Remediation Available

radare2Debian

Fixed in:5.9.0+dfsg-1CVE-2021-4021

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.03%probability of exploitation in 30 days

59thpercentile

Moderate risk: more likely to be exploited than 59% of all known CVEs.

References

Exploit1

github.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.