BugZero | F5 BugID 1786805 - TMM might crash immediately after going active for...

F5 - Defect ID: 1786805

TMM might crash immediately after going active for the first time after a reboot

F5 - Defect ID: 1786805

TMM might crash immediately after going active for the first time after a reboot

Last updated on April 7th, 2026

BugZero Risk Score
6.9 Medium

Overall: 6.9

Severity: 7.3

Community: 4.2

Lifecycle: 8.3

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Bug Details

Priority: 3-Major
Status: Verified
Impact Category: Advanced Firewall Manager

Description

Symptoms

In some rare scenarios, TMM might crash immediately after going active for the first time after a system reboot.

Impact

Traffic disrupted while tmm restarts.

Conditions

-- A virtual server has a DoS profile attached. -- The BIG-IP goes active for the first time after a reboot.

Workaround

None

Fix Information

None

Change history

Links

Original Vendor Announcement

Relevant Products

Click on a version to see all relevant bugs

Affected versions:15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 15.1.1, 15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1, 15.1.8.2, 15.1.9, 15.1.9.1, 15.1.10, 15.1.10.2, 15.1.10.3, 15.1.10.4, 15.1.10.5, 15.1.10.6, 15.1.10.7, 15.1.10.8, 16.1.0, 16.1.1, 16.1.2, 16.1.2.1, 16.1.2.2, 16.1.3, 16.1.3.1, 16.1.3.2, 16.1.3.3, 16.1.3.4, 16.1.3.5, 16.1.4, 16.1.4.1, 16.1.4.2, 16.1.4.3, 16.1.5, 16.1.5.1, 16.1.5.2, 16.1.6, 16.1.6.1, 17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1, 17.1.1.2, 17.1.1.3, 17.1.1.4, 17.1.2, 17.1.2.1, 17.1.2.2

Fixed versions: 21.0.0, 17.1.3

Relevant Products

Click on a version to see all relevant bugs

Fixed versions: 21.0.0, 17.1.3

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F5 Integration

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F5 Integration

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BugZero Plan

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BugZero Plan

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F5 - Defect ID: 1786805

TMM might crash immediately after going active for the first time after a reboot

F5 - Defect ID: 1786805

TMM might crash immediately after going active for the first time after a reboot

Last updated on April 7th, 2026

BugZero Risk Score6.9 Medium

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Links

Top F5 Defects

Ready to prevent the next vendor outage?

F5 - Defect ID: 1786805

TMM might crash immediately after going active for the first time after a reboot

F5 - Defect ID: 1786805

TMM might crash immediately after going active for the first time after a reboot

Last updated on April 7th, 2026

BugZero Risk Score6.9 Medium

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Links

Top F5 Defects

Ready to prevent the next vendor outage?

BugZero Risk Score
6.9 Medium

BugZero Risk Score
6.9 Medium