CVE-2024-39778Network attack vector

Traffic interruption via TMM termination

Published Aug 14, 2024 · Updated Aug 14, 2024

Denial of service in affected F5 BIG-IP releases allows remote attackers to terminate TMM via undisclosed network requests. The requests reach TMM only when a stateless virtual server uses a High-Speed Bridge, but F5 has not disclosed the request format or implementation error. No authentication or user interaction is required; TMM termination interrupts application traffic handled by the affected system.

CVSS severity8.7
High
EPSS probability0.48%
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 affected F5 BIG-IP releases allows remote attackers to terminate TMM via undisclosed network requests. The requests reach TMM only when a stateless virtual server uses a High-Speed Bridge, but F5 has not disclosed the request format or implementation error. No authentication or user interaction is required; TMM termination interrupts application traffic handled by the affected system.

The record

CVE
CVE-2024-39778
Published
Aug 14, 2024
Updated
Aug 14, 2024
Vendor
F5 Networks
Product
BIG-IP
Classifications
CWE-702, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 14, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 14, 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=15.1.0 <=*
  2. Affected versionversion=15.1.0 <*
  3. Affected versionversion=16.1.0 <16.1.5
  4. Affected versionversion=17.1.0 <17.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IPversion=15.1.0 <=*; version=15.1.0 <*; version=16.1.0 <16.1.5; version=17.1.0 <17.1.1

Published CVSS scores

7.5F5 NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7F5 NetworksCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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 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-702Weaknesses Introduced During Implementation
T1499Endpoint Denial of Service

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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