CVE-2021-4021
CVE-2021-4021 is a high-severity vulnerability in Radare Radare2 with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-834.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v2: 5.0
- EPSS exploit prediction: 1% (60th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-834
- Affected product: Radare Radare2
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2021-4021?
- 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.
- How severe is CVE-2021-4021?
- CVE-2021-4021 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2021-4021 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-4021?
- CVE-2021-4021 affects Radare Radare2. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-4021?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-4021 published?
- CVE-2021-4021 was published on 2022-02-24 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:radare:radare2:*:*:*:*:*:*:*:*
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