CVE-2024-34161Network attack vector

Memory disclosure via dangling QUIC buffer pointer

Published May 29, 2024 · Updated Feb 13, 2025

Use-after-free in F5 NGINX Open Source 1.25.0 through 1.26.0 and NGINX Plus R30 through R31 allows remote attackers to read worker memory. ngx_quic_free_buffer() frees a QUIC buffer's chains but leaves last_chain referencing the released chains and buffers, permitting later QUIC processing to reuse freed memory. Exposure requires HTTP/3 QUIC to be enabled and a network path with an MTU of 4096 bytes or greater without fragmentation; disclosure is limited to worker-process memory.

CVSS severity5.3
Medium
EPSS probability0.87%
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 F5 NGINX Open Source 1.25.0 through 1.26.0 and NGINX Plus R30 through R31 allows remote attackers to read worker memory. ngx_quic_free_buffer() frees a QUIC buffer's chains but leaves last_chain referencing the released chains and buffers, permitting later QUIC processing to reuse freed memory. Exposure requires HTTP/3 QUIC to be enabled and a network path with an MTU of 4096 bytes or greater without fragmentation; disclosure is limited to worker-process memory.

The record

CVE
CVE-2024-34161
Published
May 29, 2024
Updated
Feb 13, 2025
Vendor
F5 Networks
Product
NGINX Open Source
Classifications
CWE-416
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

5.3F5 NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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-416Use After Free

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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