CVE-2024-24989Network attack vector

Worker-process crash via NULL pointer dereference

Published Feb 14, 2024 · Updated May 12, 2025

NULL pointer dereference in NGINX Open Source 1.25.3 and NGINX Plus R31 allows remote attackers to crash workers via crafted QUIC sessions. The HTTP/3 QUIC module dereferences a null pointer while processing an undisclosed crafted QUIC session, terminating its worker process. Exposure requires a build containing ngx_http_v3_module and a configuration whose listen directive uses quic; the experimental module is not enabled by default.

CVSS severity7.5
High
EPSS probability1.06%
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 NGINX Open Source 1.25.3 and NGINX Plus R31 allows remote attackers to crash workers via crafted QUIC sessions. The HTTP/3 QUIC module dereferences a null pointer while processing an undisclosed crafted QUIC session, terminating its worker process. Exposure requires a build containing ngx_http_v3_module and a configuration whose listen directive uses quic; the experimental module is not enabled by default.

The record

CVE
CVE-2024-24989
Published
Feb 14, 2024
Updated
May 12, 2025
Vendor
F5 Networks
Product
NGINX Open Source
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 14, 2024CVE publishedPublication date reported by the CVE source.
  2. May 12, 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=1.25.3 <1.25.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · NGINX Open Sourceversion=1.25.3 <1.25.4
F5 Networks · NGINX Plusversion=R31 <R31 P1

Published CVSS scores

7.5F5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NVDCVSS: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-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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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