CVE-2024-21849Network attack vector

TMM process termination via undisclosed WebSockets traffic

Published Feb 14, 2024 · Updated Aug 1, 2024

Denial of service in F5 BIG-IP 16.1.0 through 16.1.3 allows remote attackers to terminate the TMM process via crafted traffic. F5 has not disclosed the traffic structure or exact faulty operation; its CWE mapping identifies a returned pointer outside the expected range. Exploitation requires a virtual server configured with both an Advanced WAF/ASM security policy and a WebSockets profile, and TMM termination interrupts traffic processing.

CVSS severity7.5
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in F5 BIG-IP 16.1.0 through 16.1.3 allows remote attackers to terminate the TMM process via crafted traffic. F5 has not disclosed the traffic structure or exact faulty operation; its CWE mapping identifies a returned pointer outside the expected range. Exploitation requires a virtual server configured with both an Advanced WAF/ASM security policy and a WebSockets profile, and TMM termination interrupts traffic processing.

The record

CVE
CVE-2024-21849
Published
Feb 14, 2024
Updated
Aug 1, 2024
Vendor
F5 Networks
Product
BIG-IP
Classifications
CWE-466, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 14, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 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=16.1.0 <16.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IPversion=16.1.0 <16.1.4

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 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-466Return of Pointer Value Outside of Expected Range
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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