BugZero | F5 BugID 674328 - Multicast UDP from BIG-IP may have incorrect check...

F5 - Defect ID: 674328

Multicast UDP from BIG-IP may have incorrect checksums

F5 - Defect ID: 674328

Multicast UDP from BIG-IP may have incorrect checksums

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: TMOS

Description

Symptoms

BIG-IP may transmit UDP datagrams with a bad checksum.

Impact

Packets may be dropped by adjacent devices.

Conditions

Outgoing link-local multicast UDP traffic from the Linux host, such as RIP.

Workaround

Disable checksum offloading on the virtual NIC for affected VLANS, e.g. "ethtool --offload vlan1274 rx on tx off"

Fix Information

Link-local multicast UDP packets are no longer sent with incorrect checksums.

Change history

Links

Original Vendor Announcement

Relevant Products

Click on a version to see all relevant bugs

Affected versions: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, 11.6.5.1, 11.6.5.2, 11.6.5.3, 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

Fixed versions: 13.1.0

Relevant Products

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Fixed versions: 13.1.0

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F5 - Defect ID: 674328

Multicast UDP from BIG-IP may have incorrect checksums

F5 - Defect ID: 674328

Multicast UDP from BIG-IP may have incorrect checksums

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: 674328

Multicast UDP from BIG-IP may have incorrect checksums

F5 - Defect ID: 674328

Multicast UDP from BIG-IP may have incorrect checksums

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