BugZero | F5 BugID 452439 - TMM may crash when enabling DOS sweep/flood if a T...

F5 - Defect ID: 452439

TMM may crash when enabling DOS sweep/flood if a TMM process has multiple threads

F5 - Defect ID: 452439

TMM may crash when enabling DOS sweep/flood if a TMM process has multiple threads

Last updated on July 18th, 2026

BugZero Risk Score
6.7 Medium

Overall: 6.7

Severity: 7.3

Community: 4.2

Lifecycle: 6.4

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Bug Details

Priority: 3-Major
Status: Not Verified
Impact Category: Local Traffic Manager

Description

Symptoms

There is a bug caused by race condition in the library used by the AFM Sweep/flood feature. When the Sweep/flood feature is enabled, if one TMM process has multiple threads, one thread may attempt to access the memory released by another thread at some time. In this situation, TMM may crash due to access an invalid memory segment.

Impact

Traffic disrupted while tmm restarts.

Conditions

(1) AFM sweep/flood enabled (2) A single TMM process has multiple threads. (3) race condition occurs

Workaround

Disable thread or disable sweep/flood

Fix Information

TMM will not crash when enabling DOS sweep/flood detection feature regardless of threading.

Change history

Links

Original Vendor Announcement

Relevant Products

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Affected versions:11.5.1, 11.5.1 hf1, 11.5.1 hf2, 11.5.1 hf3, 11.5.1 hf4, 11.5.1 hf5, 11.5.1 hf6, 11.5.1 hf7, 11.5.1 hf8, 11.5.1 hf9, 11.5.1 hf10, 11.5.1 hf11, 11.5.2, 11.5.2 hf1, 11.5.3, 11.5.3 hf1, 11.5.3 hf2, 11.5.4, 11.5.4 hf1, 11.5.4 hf2, 11.5.4 hf3, 11.5.4 hf4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.5.10, 11.6.0, 11.6.0 hf1, 11.6.0 hf2, 11.6.0 hf3, 11.6.0 hf4, 11.6.0 hf5, 11.6.0 hf6, 11.6.0 hf7, 11.6.0 hf8

Fixed versions: 12.0.0, 11.6.1

Relevant Products

Click on a version to see all relevant bugs

Fixed versions: 12.0.0, 11.6.1

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F5 - Defect ID: 452439

TMM may crash when enabling DOS sweep/flood if a TMM process has multiple threads

F5 - Defect ID: 452439

TMM may crash when enabling DOS sweep/flood if a TMM process has multiple threads

Last updated on July 18th, 2026

BugZero Risk Score6.7 Medium

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Links

Top F5 Defects

Ready to prevent the next vendor outage?

F5 - Defect ID: 452439

TMM may crash when enabling DOS sweep/flood if a TMM process has multiple threads

F5 - Defect ID: 452439

TMM may crash when enabling DOS sweep/flood if a TMM process has multiple threads

Last updated on July 18th, 2026

BugZero Risk Score6.7 Medium

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Links

Top F5 Defects

Ready to prevent the next vendor outage?

BugZero Risk Score
6.7 Medium

BugZero Risk Score
6.7 Medium