Last Modified: May 05, 2026
Affected Product(s):
BIG-IP TMOS
Fixed In:
17.5.1.6, 17.1.3.2
Opened: Dec 07, 2025 Severity: 3-Major
When a PUT request is made without specifying a source address, the system defaults to an IPv6 address (::). If the destination address is IPv4, this causes a validation error due to the mismatch between the source and destination address types.
The request fails with an address type mismatch error, requiring users to specify a compatible source address. This inconsistency between POST and PUT operations may cause confusion for users.
A PUT request issued without a source address, having the destination address IPv4 The system attempts to apply a default IPv6 source address
Explicitly specify a source address that matches the type (IPv4 or IPv6) of the destination address in the request payload.
The behavior of PUT requests has been updated to match that of POST requests. If a source address is not specified, the system now selects an appropriate default (IPv4 or IPv6) based on the destination address, ensuring consistency and avoiding address type mismatch errors.