Last Modified: Jun 09, 2026
Affected Product(s):
BIG-IP Install/Upgrade
Known Affected Versions:
17.5.1, 17.5.1.2, 17.5.1.3, 21.0.0, 21.0.0.1
Fixed In:
17.5.1.4
Opened: May 26, 2025 Severity: 2-Critical
When upgrading from versions prior to 17.5.0 to 17.5.1 or later, the #TMSH-VERSION marker in bigip_base.conf is overwritten with the target system version instead of preserving the source UCS version. This prevents the MCPD schema migration code from executing, potentially leading to configuration mismatches and missing schema-based workarounds.
Overwriting the #TMSH-VERSION in the bigip_base.conf file results in the wrong schema being used during configuration loading, leading to missed MCP schema-based workarounds.
Roll-forward upgrades from versions 14.x, 15.x, 16.x, or 17.1.x to 17.5.1 and later releases are affected. Upgrades from version 17.5.x to 21.x and later versions are not impacted.
None
None