Last Modified: Apr 17, 2026
Affected Product(s):
BIG-IP AFM
Known Affected Versions:
15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 15.1.1, 15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1, 15.1.8.2, 15.1.9, 15.1.9.1, 15.1.10, 15.1.10.2, 15.1.10.3, 15.1.10.4, 15.1.10.5, 15.1.10.6, 15.1.10.7, 15.1.10.8
Opened: Mar 29, 2024 Severity: 3-Major
- MCPD takes a long time to process large firewall rule stats (about 20k), and sometimes much longer. - MCPD abruptly drops the LACPD connection, causing LACPD to restart. - Multiple “MCPD query response exceeding” messages appear, followed by bcm core dumps (e.g., 010e0004:4: MCPD query response exceeding 60 seconds). - SNMP warnings report “MCPD query response exceeding 30 seconds.” - MCP query execution times are very long and highly variable. - bcm56xxd blocks in mcpmsg_send() or writev(). - bcm56xxd core files are generated. - MCP message body_length fields are corrupted, far exceeding the buffer size.
- MCPD fw_rule_stat queries are slow; LACPD restarts abruptly, potentially leading to bcm core. - Control plane instability. - SNMP monitoring disruption. - bcm56xxd crash and restart.
- More than 20k firewall rules are configured, and pccd.overlap.check is enabled. - Large statistics tables are present. - SNMP performs table walks over MCP-backed statistics. - MCP message size grows beyond expected limits due to incorrect accumulation logic.
- Disable db pccd.overlap.check - Reduce SNMP polling frequency - Avoid wide SNMP table walks over large statistics tables
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