Last Modified: Jun 05, 2026
Affected Product(s):
BIG-IP AFM, LTM
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, 16.1.0, 16.1.1, 16.1.2, 16.1.2.1, 16.1.2.2, 16.1.3, 16.1.3.1, 16.1.3.2, 16.1.3.3, 16.1.3.4, 16.1.3.5, 16.1.4, 16.1.4.1, 16.1.4.2, 16.1.4.3, 16.1.5, 16.1.5.1, 16.1.5.2, 16.1.6, 16.1.6.1, 17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 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, 17.1.3.1, 17.1.3.2, 17.5.0, 17.5.1, 17.5.1.2, 17.5.1.3, 17.5.1.4, 17.5.1.5, 17.5.1.6, 21.0.0, 21.0.0.1
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
Any of these conditions can act as a trigger: - 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 (if AFM is involved) - Reduce SNMP polling frequency - Avoid wide SNMP table walks over large statistics tables
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