Last Modified: Aug 28, 2026
Affected Product(s):
BIG-IP TMOS
Known Affected Versions:
17.1.3.4, 17.5.1.5, 17.5.1.6, 17.5.1.8, 21.0.0.1, 21.0.0.2, 21.0.0.3, 21.1.0.1
Opened: Feb 27, 2026 Severity: 2-Critical
- Memory corruption in shared memory regions (bcCacheIndex and bcCacheEnd) during BrightCloud database cache loading - Large and invalid differences between cache index values cause crashes or undefined behavior in URL categorization processes
Memory corruption leads to out-of-bounds memory access, resulting in crashes or unpredictable system behavior during URL categorization lookups
Occurs during database cache loading into shared memory regions, either due to pre-existing corruption or invalid data loads
The issue is resolved by adding integrity validation checks to the shared memory reuse process and the database cache loading cycle
None