CVE-2023-34241Network attack vector

Service crash via post-close hostname logging

Published Jun 22, 2023 · Updated Feb 13, 2025

Use-after-free in CUPS 2.0.0 through 2.4.5 allows remote attackers to crash cupsd through a rejected or unresolved connection. In cupsdAcceptClient, httpClose frees con->http before cupsdLogClient passes the dangling pointer to httpGetHostname while recording the warning. Reachability requires LogLevel warn or higher plus either a failed double hostname lookup or a TCP-wrappers rejection; a crash interrupts printing, while a local log reader can expose daemon memory.

CVSS severity5.3
Medium
EPSS probability1.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in CUPS 2.0.0 through 2.4.5 allows remote attackers to crash cupsd through a rejected or unresolved connection. In cupsdAcceptClient, httpClose frees con->http before cupsdLogClient passes the dangling pointer to httpGetHostname while recording the warning. Reachability requires LogLevel warn or higher plus either a failed double hostname lookup or a TCP-wrappers rejection; a crash interrupts printing, while a local log reader can expose daemon memory.

The record

CVE
CVE-2023-34241
Published
Jun 22, 2023
Updated
Feb 13, 2025
Vendor
OpenPrinting
Product
CUPS
Classifications
CWE-416, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 22, 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=>= 2.0.0, < 2.4.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenPrinting · CUPSversion=>= 2.0.0, < 2.4.6

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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