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CVE-2021-32613: In radare2 through 5.3.0 there is a double free vulnerability in the pyc parse via a crafted file which can...

In radare2 through 5.3.0 there is a double free vulnerability in the pyc parse via a crafted file which can lead to DoS.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-32613 affects radare2, a reverse engineering tool. A specially crafted Python bytecode file can trigger a double free during parsing and cause denial of service. The sources do not show code execution, public exploitation, or CISA KEV listing.

Executive priority

Treat this as a moderate operational risk, not an emergency, unless radare2 is used heavily on untrusted files. Prioritize remediation for security teams, malware labs, and automated analysis infrastructure.

Technical view

The issue is a CWE-416 use-after-free/double free condition in radare2's pyc parser in versions through 5.3.0. Processing a crafted file can crash the tool, creating availability risk for analyst workstations or automated file-analysis pipelines.

Likely exposure

Exposure is most likely where radare2 versions up to and including 5.3.0 parse untrusted or externally supplied Python bytecode files, including malware analysis, reverse engineering, triage, or CI-style analysis systems.

Exploitation context

The provided sources describe crafted-file denial of service. They do not support active exploitation, remote exploitation, privilege escalation, or code execution claims. KEV status is false in the supplied bundle.

Researcher notes

Evidence points to a parser memory-management bug with denial-of-service impact. The bundle includes related radare2 GitHub issues, upstream commits, Red Hat Bugzilla, and Fedora advisories, but no CVSS vector or confirmed fixed release number.

Mitigation direction

  • Inventory radare2 installations and identify versions through 5.3.0.
  • Upgrade radare2 to a vendor-supported release newer than 5.3.0.
  • Apply relevant Fedora package advisories where Fedora packages are used.
  • Avoid parsing untrusted pyc files with vulnerable radare2 builds.
  • Isolate file-analysis workloads that must handle untrusted samples.

Validation and detection

  • Confirm installed radare2 versions are not 5.3.0 or older.
  • Review package manager history for relevant radare2 security updates.
  • Identify workflows that pass pyc files into radare2.
  • Confirm untrusted-file analysis runs in isolated environments.
  • Track upstream GitHub issues and commits for fix lineage.
Prepared
Confidence
medium
Sources
10

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-416: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2021-32613 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
9Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/aradare2radare2 versions before and including 5.3.0Listed
Weakness

CWE details

CWE-416

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-416 · source CWE mapping

Use After Free

Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs