Last Modified: Dec 16, 2025
Affected Product(s):
BIG-IP Install/Upgrade, LTM
Known Affected Versions:
17.1.1.1, 17.1.1.2, 17.1.1.3, 17.1.1.4, 17.1.2, 17.1.2.1, 17.1.2.2, 17.1.3
Opened: Dec 05, 2025 Severity: 3-Major
After upgrading from v17.1.1.1 to v17.1.3, client connections begin negotiating with unexpected lower-priority cipher suites. Applications sensitive to cipher strength (e.g., credit card payment systems) experience transaction failures or service disruption.
Failed service due to wrong Ciphers being used by the LTM VS/ Client Profile
BIG-IP system running v17.1.1.1 is upgraded to v17.1.3 or When MCPD reload After the upgrade or MCPD reload, the internal ordering of cipher rules within the cipher group is modified.
Change the group order from Default to Strength in Local Traffic ›› Ciphers : Groups
None