BugZero | F5 BugID 556785 - Not all HTTP transactions make it through credits ...

F5 - Defect ID: 556785

Not all HTTP transactions make it through credits to iRule failures when FastL4 is enabled.

F5 - Defect ID: 556785

Not all HTTP transactions make it through credits to iRule failures when FastL4 is enabled.

Last updated on July 18th, 2026

BugZero Risk Score
5.8 Medium

Overall: 5.8

Severity: 6.4

Community: 4.2

Lifecycle: 6.4

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Bug Details

Priority: 4-Minor
Status: Not Verified
Impact Category: Policy Enforcement Manager

Description

Symptoms

Some HTTP transactions are dropped

Impact

Can result in dropped flows.

Conditions

Occurs in the following scenario - PEM configured on an HTTP virtual - Transactional policy configured - iRule triggered per transaction is attached to HTTP virtual and FastL4

Workaround

To workaround this, issue can be avoided by not enabling FastL4 when iRules are present in this scenario.

Fix Information

None

Change history

Links

Original Vendor Announcement

Relevant Products

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Affected versions:12.0.0, 12.0.0 hf1, 12.0.0 hf2, 12.0.0 hf3, 12.0.0 hf4, 12.1.0, 12.1.0 hf1, 12.1.0 hf2, 12.1.1, 12.1.1 hf1, 12.1.1 hf2, 12.1.2, 12.1.2 hf1, 12.1.2 hf2, 12.1.3, 12.1.3.1, 12.1.3.2, 12.1.3.3, 12.1.3.4, 12.1.3.5, 12.1.3.6, 12.1.3.7, 12.1.4, 12.1.4.1, 12.1.5, 12.1.5.1, 12.1.5.2, 12.1.5.3, 12.1.6, 13.0.0, 13.0.0 hf1, 13.0.0 hf2, 13.0.0 hf3, 13.0.1, 13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 13.1.3, 13.1.3.1, 13.1.3.2, 13.1.3.3, 13.1.3.4, 13.1.3.5, 13.1.3.6, 13.1.4, 13.1.4.1, 13.1.5, 13.1.5.1, 14.0.0, 14.0.0.1, 14.0.0.2, 14.0.0.3, 14.0.0.4, 14.0.0.5, 14.0.1, 14.0.1.1

Fixed versions: No known fixed versions

Relevant Products

Click on a version to see all relevant bugs

Fixed versions: No known fixed versions

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F5 - Defect ID: 556785

Not all HTTP transactions make it through credits to iRule failures when FastL4 is enabled.

F5 - Defect ID: 556785

Not all HTTP transactions make it through credits to iRule failures when FastL4 is enabled.

Last updated on July 18th, 2026

BugZero Risk Score5.8 Medium

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Links

Top F5 Defects

Ready to prevent the next vendor outage?

F5 - Defect ID: 556785

Not all HTTP transactions make it through credits to iRule failures when FastL4 is enabled.

F5 - Defect ID: 556785

Not all HTTP transactions make it through credits to iRule failures when FastL4 is enabled.

Last updated on July 18th, 2026

BugZero Risk Score5.8 Medium

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Links

Top F5 Defects

Ready to prevent the next vendor outage?

BugZero Risk Score
5.8 Medium

BugZero Risk Score
5.8 Medium