CVE-2021-32494Public exploit

Process crash via zero Mach-O page size

Published Jul 7, 2023 · Updated Nov 12, 2024

Divide-by-zero in the Mach-O parser in radareorg radare2 5.3.0-git 26142 allows attackers to crash r2 or rabin2 via a crafted file. The rebase_buffer function accepts a zero page_size from Mach-O chained-starts data and uses it as the divisor when calculating page_idx. Processing the file locally is sufficient to trigger a floating-point exception that terminates the analyzing process; no data disclosure or modification is demonstrated.

CVSS severity10.0
Critical
EPSS probability0.84%
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

Divide-by-zero in the Mach-O parser in radareorg radare2 5.3.0-git 26142 allows attackers to crash r2 or rabin2 via a crafted file. The rebase_buffer function accepts a zero page_size from Mach-O chained-starts data and uses it as the divisor when calculating page_idx. Processing the file locally is sufficient to trigger a floating-point exception that terminates the analyzing process; no data disclosure or modification is demonstrated.

The record

CVE
CVE-2021-32494
Published
Jul 7, 2023
Updated
Nov 12, 2024
Vendor
radareorg
Product
radare2
Classifications
CWE-369, CAPEC-130, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 12, 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=5.3.0-git 26142

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

radareorg · radare2version=5.3.0-git 26142

Published CVSS scores

10.0Fedora ProjectCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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-369Divide By Zero
CAPEC-130Excessive Allocation
T1499.004Application or System Exploitation

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