CVE-2021-4022Public exploit

Application crash via uninitialized pointer free

Published Aug 25, 2022 · Updated Aug 3, 2024

An invalid free in Rizin 0.3.1 and earlier allows local users to crash the application by analyzing a crafted HPPA ELF64 file. In rz_core_analysis_type_match, a goto reaches cleanup before retctx.ret_reg is initialized, so free receives an indeterminate stack value. A user must direct Rizin to perform full analysis of the malicious file; the demonstrated consequence is a process crash.

CVSS severity5.5
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

An invalid free in Rizin 0.3.1 and earlier allows local users to crash the application by analyzing a crafted HPPA ELF64 file. In rz_core_analysis_type_match, a goto reaches cleanup before retctx.ret_reg is initialized, so free receives an indeterminate stack value. A user must direct Rizin to perform full analysis of the malicious file; the demonstrated consequence is a process crash.

The record

CVE
CVE-2021-4022
Published
Aug 25, 2022
Updated
Aug 3, 2024
Vendor
Rizin Organization
Product
Rizin
Classifications
CWE-416, CWE-400, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=rizin 0.3.1 and before

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Rizin Organization · Rizinversion=rizin 0.3.1 and before

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
CWE-400Uncontrolled Resource Consumption
T1204.002User Execution: Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo