CVE-2022-34655Network attack vector

Remote service interruption via HTTP payload processing

Published Aug 4, 2022 · Updated Sep 16, 2024

Use of an uninitialized variable in F5 BIG-IP allows remote attackers to crash TMM through HTTP traffic handled by an HTTP::payload iRule. F5 has not disclosed which variable is left uninitialized or the traffic pattern that triggers termination during payload access. Exposure requires 14.1.x before 14.1.5, 15.1.x before 15.1.6.1, or 16.0.x before 16.0.1.1 with the iRule on a virtual server; successful requests interrupt traffic processing.

CVSS severity7.5
High
EPSS probability0.75%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of an uninitialized variable in F5 BIG-IP allows remote attackers to crash TMM through HTTP traffic handled by an HTTP::payload iRule. F5 has not disclosed which variable is left uninitialized or the traffic pattern that triggers termination during payload access. Exposure requires 14.1.x before 14.1.5, 15.1.x before 15.1.6.1, or 16.0.x before 16.0.1.1 with the iRule on a virtual server; successful requests interrupt traffic processing.

The record

CVE
CVE-2022-34655
Published
Aug 4, 2022
Updated
Sep 16, 2024
Vendor
F5 Networks
Product
BIG-IP
Classifications
CWE-457, CWE-908, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 4, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record 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=14.1.x <14.1.5
  2. Affected versionversion=15.1.x <15.1.6.1
  3. Affected versionversion=16.0.x <16.0.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IPversion=14.1.x <14.1.5; version=15.1.x <15.1.6.1; version=16.0.x <16.0.1.1

Published CVSS scores

7.5F5 NetworksCVSS: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.

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-457Use of Uninitialized Variable
CWE-908Use of Uninitialized Resource
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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