BugZero | F5 BugID 685615 - Incorrect source mac for TCP Reset with vlangroup ...

F5 - Defect ID: 685615

Incorrect source mac for TCP Reset with vlangroup for host traffic

F5 - Defect ID: 685615

Incorrect source mac for TCP Reset with vlangroup for host traffic

Last updated on July 18th, 2026

BugZero Risk Score
6.7 Medium

Overall: 6.7

Severity: 7.3

Community: 4.2

Lifecycle: 7.0

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Bug Details

Priority: 3-Major
Status: Verified
Impact Category: Local Traffic Manager

Description

Symptoms

BIG-IP outbound host TCP RST packets have incorrect source-mac-address.

Impact

TCP Reset for traffic exiting the BIG-IP system with incorrect source-mac-address, which could include monitor traffic.

Conditions

BIG-IP host traffic is exiting via VLANs in a VLAN group.

Workaround

Use transparent mode on the VLAN group.

Fix Information

source-mac-address for host traffic is correctly set.

Change history

Links

Original Vendor Announcement

Relevant Products

Click on a version to see all relevant bugs

Affected versions:11.5.4, 11.5.4 hf1, 11.5.4 hf2, 11.5.4 hf3, 11.5.4 hf4, 11.5.5, 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, 11.6.1, 11.6.1 hf1, 11.6.1 hf2, 11.6.2, 11.6.2 hf1, 11.6.3, 11.6.3.1, 11.6.3.2, 11.6.3.3, 11.6.3.4, 11.6.4, 11.6.5, 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, 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

Fixed versions: 14.0.0, 13.1.0.6, 12.1.3.6, 11.6.5.1, 11.5.6

Relevant Products

Click on a version to see all relevant bugs

Fixed versions: 14.0.0, 13.1.0.6, 12.1.3.6, 11.6.5.1, 11.5.6

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F5 - Defect ID: 685615

Incorrect source mac for TCP Reset with vlangroup for host traffic

F5 - Defect ID: 685615

Incorrect source mac for TCP Reset with vlangroup for host traffic

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: 685615

Incorrect source mac for TCP Reset with vlangroup for host traffic

F5 - Defect ID: 685615

Incorrect source mac for TCP Reset with vlangroup for host traffic

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