CVE-2021-39432Public exploitNetwork attack vector

Application crash via stale JPEG error jump

Published Nov 4, 2022 · Updated May 2, 2025

Double free in ImageReadJPEG in DIPlib before 3.1.0 allows attackers to crash a consuming application via a crafted JPEG image. The libjpeg error callback long-jumps to a setjmp target inside a completed JpegInput constructor, causing C++ string storage to be destroyed twice. Exploitation requires a user or consuming workflow to pass an attacker-supplied malformed JPEG to the reader; the demonstrated result is process termination.

CVSS severity6.5
Medium
EPSS probability0.69%
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 ImageReadJPEG in DIPlib before 3.1.0 allows attackers to crash a consuming application via a crafted JPEG image. The libjpeg error callback long-jumps to a setjmp target inside a completed JpegInput constructor, causing C++ string storage to be destroyed twice. Exploitation requires a user or consuming workflow to pass an attacker-supplied malformed JPEG to the reader; the demonstrated result is process termination.

The record

CVE
CVE-2021-39432
Published
Nov 4, 2022
Updated
May 2, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, CWE-415, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 4, 2022CVE publishedPublication date reported by the CVE source.
  2. May 2, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6.5CISA ADP VulnrichmentCVSS:3.1/AV:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
CWE-415Double Free
T1203Exploitation for Client Execution

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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