CVE-2024-31079Network attack vector

Worker crash via HTTP/3 stack buffer overflow

Published May 29, 2024 · Updated Feb 13, 2025

Stack-based buffer overflow in F5 NGINX Open Source 1.25.0 through 1.26.0 and NGINX Plus R30 through R31 allows remote attackers to crash workers. The ngx_http_v3_module mishandles an undisclosed HTTP/3 request and triggers a stack-based buffer overflow; F5 has not disclosed the field or memory operation. Exploitation requires a QUIC-enabled listener and precise timing during connection draining, which attackers cannot observe and can influence only narrowly.

CVSS severity4.8
Medium
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in F5 NGINX Open Source 1.25.0 through 1.26.0 and NGINX Plus R30 through R31 allows remote attackers to crash workers. The ngx_http_v3_module mishandles an undisclosed HTTP/3 request and triggers a stack-based buffer overflow; F5 has not disclosed the field or memory operation. Exploitation requires a QUIC-enabled listener and precise timing during connection draining, which attackers cannot observe and can influence only narrowly.

The record

CVE
CVE-2024-31079
Published
May 29, 2024
Updated
Feb 13, 2025
Vendor
F5 Networks
Product
NGINX Open Source
Classifications
CWE-121, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 29, 2024CVE 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=1.25.0 <=1.26.0
  2. Affected versionversion=1.25.0 <1.26.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · NGINX Open Sourceversion=1.25.0 <=1.26.0; version=1.25.0 <1.26.1
F5 Networks · NGINX Plusversion=r30 <=r31; version=R30 <R32

Published CVSS scores

4.8F5CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/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 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-121Stack-based Buffer Overflow
T1499.004Application or System Exploitation DoS

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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