CVE-2021-32493Public exploit

Application crash via wrapped bitmap row size

Published Jun 24, 2021 · Updated Aug 3, 2024

Heap buffer overflow in bitmap decoding in DjVuLibre 3.5.28 and earlier allows local users to crash applications via a crafted DjVu file. DJVU::GBitmap::decode stores the sum of ncolumns and border in an unsigned short without checking for wraparound, then writes beyond the undersized row buffer. Exploitation requires a crafted document to be decoded; the demonstrated consequence is a process crash, and no broader memory-corruption impact is established.

CVSS severity7.8
High
EPSS probability1.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in bitmap decoding in DjVuLibre 3.5.28 and earlier allows local users to crash applications via a crafted DjVu file. DJVU::GBitmap::decode stores the sum of ncolumns and border in an unsigned short without checking for wraparound, then writes beyond the undersized row buffer. Exploitation requires a crafted document to be decoded; the demonstrated consequence is a process crash, and no broader memory-corruption impact is established.

The record

CVE
CVE-2021-32493
Published
Jun 24, 2021
Updated
Aug 3, 2024
Vendor
DjVuLibre Project
Product
DjVuLibre
Classifications
CWE-119, CWE-787, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 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=djvulibre-3.5.28 and earlier

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

DjVuLibre Project · DjVuLibreversion=djvulibre-3.5.28 and earlier

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.5SUSECVSS: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.

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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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-787Out-of-bounds Write
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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