CVE-2024-33600Network attack vector

Daemon crash via failed netgroup cache insertion

Published May 6, 2024 · Updated Jul 14, 2026

NULL pointer dereference in glibc nscd 2.15 through 2.39 allows attackers to crash the daemon via a netgroup request. The addinnetgrX function dereferences a null result after addgetnetgrentX fails while inserting a not-found netgroup response into the cache. The flaw exists only in the nscd binary and requires cache insertion failure, interrupting cached name-service requests until the daemon restarts.

CVSS severity5.9
Medium
EPSS probability1.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in glibc nscd 2.15 through 2.39 allows attackers to crash the daemon via a netgroup request. The addinnetgrX function dereferences a null result after addgetnetgrentX fails while inserting a not-found netgroup response into the cache. The flaw exists only in the nscd binary and requires cache insertion failure, interrupting cached name-service requests until the daemon restarts.

The record

CVE
CVE-2024-33600
Published
May 6, 2024
Updated
Jul 14, 2026
Vendor
The GnuPG Project
Product
glibc
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 2024CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record 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=2.15 <2.40

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The GnuPG Project · glibcversion=2.15 <2.40
Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.5 <*
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*

Published CVSS scores

5.9CISA ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
5.3Oracle LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
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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