CVE-2023-32324Public exploitNetwork attack vector

Service crash via zero-length string copy

Published Jun 1, 2023 · Updated Feb 13, 2025

Heap buffer overflow in OpenPrinting CUPS 2.4.2 and earlier allows remote attackers to crash cupsd via a crafted network request. During debug-level request logging, format_log_line can pass a zero-length destination to _cups_strlcpy, which writes past the heap buffer because it lacks a size-zero guard. The service must accept the request and cupsd.conf must set LogLevel to DEBUG; the demonstrated consequence is a cupsd crash, not verified code execution.

CVSS severity7.5
High
EPSS probability1.46%
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 OpenPrinting CUPS 2.4.2 and earlier allows remote attackers to crash cupsd via a crafted network request. During debug-level request logging, format_log_line can pass a zero-length destination to _cups_strlcpy, which writes past the heap buffer because it lacks a size-zero guard. The service must accept the request and cupsd.conf must set LogLevel to DEBUG; the demonstrated consequence is a cupsd crash, not verified code execution.

The record

CVE
CVE-2023-32324
Published
Jun 1, 2023
Updated
Feb 13, 2025
Vendor
OpenPrinting
Product
CUPS
Classifications
CWE-787, CWE-122, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 2.4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenPrinting · CUPSversion=<= 2.4.2

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/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-787Out-of-bounds Write
CWE-122Heap-based Buffer Overflow
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

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Your stack

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