Last Modified: Jan 19, 2026
Affected Product(s):
BIG-IP Install/Upgrade
Known Affected Versions:
17.5.0, 17.5.1, 17.5.1.2, 17.5.1.3, 21.0.0
Opened: May 26, 2025 Severity: 2-Critical
When upgrading from versions below 17.5.0 to 17.5.0 or later, the #TMSH-VERSION marker in bigip_base.conf is rewritten to the target system version instead of preserving the source UCS version. This prevents MCPD schema migration code from executing, potentially causing configuration mismatches and missing schema-based workarounds.
Overwriting TMSH-VERSION in bigip_base.conf file, uses the wrong schema when loading the configuration and miss applying MCP schema based workarounds.
- roll-forward upgrade from v14.x/v15.x/v16.x/v17.1.x to v17.5.1 and later releases. upgrade from v17.5.x to v21.x and later versions is not affected.
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