CVE-2021-32614Public exploit

Heap-data disclosure via unchecked fixed-length copy

Published May 26, 2021 · Updated Aug 3, 2024

Out-of-bounds read in dmg2img through 20170502 allows local users to crash the converter by processing a crafted DMG archive. The fill_mishblk function copies a fixed 0xCC bytes from an attacker-controlled heap buffer without verifying that the allocation is that large. Processing the file requires user interaction; the out-of-bounds bytes can also disclose adjacent heap data, but no code execution is demonstrated.

CVSS severity7.1
High
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in dmg2img through 20170502 allows local users to crash the converter by processing a crafted DMG archive. The fill_mishblk function copies a fixed 0xCC bytes from an attacker-controlled heap buffer without verifying that the allocation is that large. Processing the file requires user interaction; the out-of-bounds bytes can also disclose adjacent heap data, but no code execution is demonstrated.

The record

CVE
CVE-2021-32614
Published
May 26, 2021
Updated
Aug 3, 2024
Vendor
dmg2img Project
Product
dmg2img
Classifications
CWE-125, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 26, 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=dmg2img through 20170502

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

dmg2img Project · dmg2imgversion=dmg2img through 20170502

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
5.8NIST NVDAV:N/AC:M/Au:N/C:P/I:N/A:P

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.

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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-125Out-of-bounds Read
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

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Your stack

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