CVE-2021-32613Public exploit

Process crash via PYC parser double free

Published May 14, 2021 · Updated Aug 3, 2024

Double free in the PYC parser in radareorg radare2 5.3.0 and earlier allows local users to crash the process via a crafted file. In extract_sections_symbols, error paths free objects that remain owned by shared lists, so later processing reads or frees the same allocation again. Exploitation requires analysis of attacker-supplied Python bytecode, and the demonstrated consequence is termination of the affected radare2 or rabin2 process.

CVSS severity5.5
Medium
EPSS probability1.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in the PYC parser in radareorg radare2 5.3.0 and earlier allows local users to crash the process via a crafted file. In extract_sections_symbols, error paths free objects that remain owned by shared lists, so later processing reads or frees the same allocation again. Exploitation requires analysis of attacker-supplied Python bytecode, and the demonstrated consequence is termination of the affected radare2 or rabin2 process.

The record

CVE
CVE-2021-32613
Published
May 14, 2021
Updated
Aug 3, 2024
Vendor
radareorg
Product
radare2
Classifications
CWE-416, CWE-415, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 14, 2021CVE 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

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Is a vulnerable build present?

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

  1. Affected versionversion=radare2 versions before and including 5.3.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

radareorg · radare2version=radare2 versions before and including 5.3.0

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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-415Double Free
T1204.002Malicious File

Public exploit references

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

Technologies

Your stack

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Your stack

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