CVE-2023-51104Network attack vector

Reported image-processing crash via zero-span division

Published Dec 26, 2023 · Updated Apr 23, 2025

A reported divide-by-zero in MuPDF 1.23.4 allows attackers to crash image processing with a crafted binary PNM image. The report says pnm_binary_read_image() divides SIZE_MAX by a zero span calculated from the colorspace component count and sample byte width. Artifex states that the caller guarantees one or three components, making a zero span unreachable in valid call paths; the supplier therefore disputes the reported crash.

CVSS severity7.5
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

A reported divide-by-zero in MuPDF 1.23.4 allows attackers to crash image processing with a crafted binary PNM image. The report says pnm_binary_read_image() divides SIZE_MAX by a zero span calculated from the colorspace component count and sample byte width. Artifex states that the caller guarantees one or three components, making a zero span unreachable in valid call paths; the supplier therefore disputes the reported crash.

The record

CVE
CVE-2023-51104
Published
Dec 26, 2023
Updated
Apr 23, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-369
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5UbuntuCVSS: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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-369Divide By Zero

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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