BugZero | F5 BugID 818505 - Modifying a virtual address with an iControl PUT c...

F5 - Defect ID: 818505

Modifying a virtual address with an iControl PUT command causes the netmask to always change to IPv6 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

F5 - Defect ID: 818505

Modifying a virtual address with an iControl PUT command causes the netmask to always change to IPv6 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

Last updated on July 18th, 2026

BugZero Risk Score
6.9 Medium

Overall: 6.9

Severity: 7.3

Community: 4.2

Lifecycle: 8.7

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Bug Details

Priority: 3-Major
Status: Resolved
Impact Category: TMOS

Description

Symptoms

Using an iControl PUT command to modify a virtual address will change that address's netmask to ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff.

Impact

An unintentional change to the virtual address's netmask.

Conditions

Modifying a virtual address using an iControl PUT command.

Workaround

Two options: -- Use a PATCH command instead of a PUT command. -- Always specify the netmask explicitly when making changes.

Fix Information

None

Change history

Links

Original Vendor Announcement

Relevant Products

Click on a version to see all relevant bugs

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, 14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 14.1.2.3, 14.1.2.4, 14.1.2.5, 14.1.2.6, 14.1.2.7, 14.1.2.8, 14.1.3, 14.1.3.1, 14.1.4, 14.1.4.1, 14.1.4.2, 14.1.4.3, 14.1.4.4, 14.1.4.5, 14.1.4.6, 14.1.5, 14.1.5.1, 14.1.5.2, 14.1.5.3, 14.1.5.4, 14.1.5.6, 15.0.0, 15.0.1, 15.0.1.1, 15.0.1.2, 15.0.1.3, 15.0.1.4, 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

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: 818505

Modifying a virtual address with an iControl PUT command causes the netmask to always change to IPv6 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

F5 - Defect ID: 818505

Modifying a virtual address with an iControl PUT command causes the netmask to always change to IPv6 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

Last updated on July 18th, 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: 818505

Modifying a virtual address with an iControl PUT command causes the netmask to always change to IPv6 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

F5 - Defect ID: 818505

Modifying a virtual address with an iControl PUT command causes the netmask to always change to IPv6 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

Last updated on July 18th, 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