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CVE-2016-6876

The RESOLV::lookup iRule command in F5 BIG-IP LTM, APM, ASM, and Link Controller 10.2.1 through 10.2.4, 11.2.1, 11.4.x, 11.5.x before 11.5.4 HF2, 11.6.x before 11.6.1, and 12.0.0 before HF3; BIG-IP AAM, AFM, and PEM 11.4.x, 11.5.x before 11.5.4 HF2, 11.6.x before 11.6.1, and 12.0.0 before HF3; BIG-IP Analytics 11.2.1, 11.4.x, 11.5.x before 11.5.4 HF2, 11.6.x before 11.6.1, and 12.0.0 before HF3; BIG-IP DNS 12.0.0 before HF3; BIG-IP Edge Gateway, WebAccelerator, and WOM 10.2.1 through 10.2.4 and 11.2.1; BIG-IP GTM 10.2.1 through 10.2.4, 11.2.1, 11.4.x, 11.5.x before 11.5.4 HF2, and 11.6.x before 11.6.1; and BIG-IP PSM 10.2.1 through 10.2.4 and 11.4.0 through 11.4.1 allows remote DNS servers to cause a denial of service (CPU consumption or Traffic Management Microkernel crash) via a crafted PTR response.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 14 products from f5, from f5, from f5 and 11 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2016, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2016-09-07T19:28:17.927

Last Modified

2025-04-12T10:46:40.837

Status

Deferred

Source

[email protected]

Severity

CVSSv3.0: 7.5 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-399

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	f5	big-ip_local_traffic_manager	10.2.1	Yes
Application	f5	big-ip_local_traffic_manager	10.2.2	Yes
Application	f5	big-ip_local_traffic_manager	10.2.3	Yes
Application	f5	big-ip_local_traffic_manager	10.2.4	Yes
Application	f5	big-ip_local_traffic_manager	11.2.1	Yes
Application	f5	big-ip_local_traffic_manager	11.4.0	Yes
Application	f5	big-ip_local_traffic_manager	11.4.1	Yes
Application	f5	big-ip_local_traffic_manager	11.5.0	Yes
Application	f5	big-ip_local_traffic_manager	11.5.1	Yes
Application	f5	big-ip_local_traffic_manager	11.5.2	Yes
Application	f5	big-ip_local_traffic_manager	11.5.3	Yes
Application	f5	big-ip_local_traffic_manager	11.5.4	Yes
Application	f5	big-ip_local_traffic_manager	11.6.0	Yes
Application	f5	big-ip_local_traffic_manager	12.0.0	Yes
Application	f5	big-ip_webaccelerator	10.2.1	Yes
Application	f5	big-ip_webaccelerator	10.2.2	Yes
Application	f5	big-ip_webaccelerator	10.2.3	Yes
Application	f5	big-ip_webaccelerator	10.2.4	Yes
Application	f5	big-ip_webaccelerator	11.2.1	Yes
Application	f5	big-ip_application_acceleration_manager	11.4.0	Yes
Application	f5	big-ip_application_acceleration_manager	11.4.1	Yes
Application	f5	big-ip_application_acceleration_manager	11.5.0	Yes
Application	f5	big-ip_application_acceleration_manager	11.5.1	Yes
Application	f5	big-ip_application_acceleration_manager	11.5.2	Yes
Application	f5	big-ip_application_acceleration_manager	11.5.3	Yes
Application	f5	big-ip_application_acceleration_manager	11.5.4	Yes
Application	f5	big-ip_application_acceleration_manager	11.6.0	Yes
Application	f5	big-ip_application_acceleration_manager	12.0.0	Yes
Application	f5	big-ip_global_traffic_manager	10.2.1	Yes
Application	f5	big-ip_global_traffic_manager	10.2.2	Yes
Application	f5	big-ip_global_traffic_manager	10.2.3	Yes
Application	f5	big-ip_global_traffic_manager	10.2.4	Yes
Application	f5	big-ip_global_traffic_manager	11.2.1	Yes
Application	f5	big-ip_global_traffic_manager	11.4.0	Yes
Application	f5	big-ip_global_traffic_manager	11.4.1	Yes
Application	f5	big-ip_global_traffic_manager	11.5.0	Yes
Application	f5	big-ip_global_traffic_manager	11.5.1	Yes
Application	f5	big-ip_global_traffic_manager	11.5.2	Yes
Application	f5	big-ip_global_traffic_manager	11.5.3	Yes
Application	f5	big-ip_global_traffic_manager	11.5.4	Yes
Application	f5	big-ip_global_traffic_manager	11.6.0	Yes
Application	f5	big-ip_link_controller	10.2.1	Yes
Application	f5	big-ip_link_controller	10.2.2	Yes
Application	f5	big-ip_link_controller	10.2.3	Yes
Application	f5	big-ip_link_controller	10.2.4	Yes
Application	f5	big-ip_link_controller	11.2.1	Yes
Application	f5	big-ip_link_controller	11.4.0	Yes
Application	f5	big-ip_link_controller	11.4.1	Yes
Application	f5	big-ip_link_controller	11.5.0	Yes
Application	f5	big-ip_link_controller	11.5.1	Yes
Application	f5	big-ip_link_controller	11.5.2	Yes
Application	f5	big-ip_link_controller	11.5.3	Yes
Application	f5	big-ip_link_controller	11.5.4	Yes
Application	f5	big-ip_link_controller	11.6.0	Yes
Application	f5	big-ip_link_controller	12.0.0	Yes
Application	f5	big-ip_advanced_firewall_manager	11.4.0	Yes
Application	f5	big-ip_advanced_firewall_manager	11.4.1	Yes
Application	f5	big-ip_advanced_firewall_manager	11.5.0	Yes
Application	f5	big-ip_advanced_firewall_manager	11.5.1	Yes
Application	f5	big-ip_advanced_firewall_manager	11.5.2	Yes
Application	f5	big-ip_advanced_firewall_manager	11.5.3	Yes
Application	f5	big-ip_advanced_firewall_manager	11.5.4	Yes
Application	f5	big-ip_advanced_firewall_manager	11.6.0	Yes
Application	f5	big-ip_advanced_firewall_manager	12.0.0	Yes
Application	f5	big-ip_protocol_security_module	10.2.1	Yes
Application	f5	big-ip_protocol_security_module	10.2.2	Yes
Application	f5	big-ip_protocol_security_module	10.2.3	Yes
Application	f5	big-ip_protocol_security_module	10.2.4	Yes
Application	f5	big-ip_protocol_security_module	11.4.0	Yes
Application	f5	big-ip_protocol_security_module	11.4.1	Yes
Application	f5	big-ip_wan_optimization_manager	10.2.1	Yes
Application	f5	big-ip_wan_optimization_manager	10.2.2	Yes
Application	f5	big-ip_wan_optimization_manager	10.2.3	Yes
Application	f5	big-ip_wan_optimization_manager	10.2.4	Yes
Application	f5	big-ip_wan_optimization_manager	11.2.1	Yes
Application	f5	big-ip_application_security_manager	10.2.1	Yes
Application	f5	big-ip_application_security_manager	10.2.2	Yes
Application	f5	big-ip_application_security_manager	10.2.3	Yes
Application	f5	big-ip_application_security_manager	10.2.4	Yes
Application	f5	big-ip_application_security_manager	11.2.1	Yes
Application	f5	big-ip_application_security_manager	11.4.0	Yes
Application	f5	big-ip_application_security_manager	11.4.1	Yes
Application	f5	big-ip_application_security_manager	11.5.0	Yes
Application	f5	big-ip_application_security_manager	11.5.1	Yes
Application	f5	big-ip_application_security_manager	11.5.2	Yes
Application	f5	big-ip_application_security_manager	11.5.3	Yes
Application	f5	big-ip_application_security_manager	11.5.4	Yes
Application	f5	big-ip_application_security_manager	11.6.0	Yes
Application	f5	big-ip_application_security_manager	12.0.0	Yes
Application	f5	big-ip_policy_enforcement_manager	11.4.0	Yes
Application	f5	big-ip_policy_enforcement_manager	11.4.1	Yes
Application	f5	big-ip_policy_enforcement_manager	11.5.0	Yes
Application	f5	big-ip_policy_enforcement_manager	11.5.1	Yes
Application	f5	big-ip_policy_enforcement_manager	11.5.2	Yes
Application	f5	big-ip_policy_enforcement_manager	11.5.3	Yes
Application	f5	big-ip_policy_enforcement_manager	11.5.4	Yes
Application	f5	big-ip_policy_enforcement_manager	11.6.0	Yes
Application	f5	big-ip_policy_enforcement_manager	12.0.0	Yes
Application	f5	big-ip_domain_name_system	12.0.0	Yes
Application	f5	big-ip_analytics	11.2.1	Yes
Application	f5	big-ip_analytics	11.4.0	Yes
Application	f5	big-ip_analytics	11.4.1	Yes
Application	f5	big-ip_analytics	11.5.0	Yes
Application	f5	big-ip_analytics	11.5.1	Yes
Application	f5	big-ip_analytics	11.5.2	Yes
Application	f5	big-ip_analytics	11.5.3	Yes
Application	f5	big-ip_analytics	11.5.4	Yes
Application	f5	big-ip_analytics	11.6.0	Yes
Application	f5	big-ip_analytics	12.0.0	Yes
Application	f5	big-ip_edge_gateway	10.2.1	Yes
Application	f5	big-ip_edge_gateway	10.2.2	Yes
Application	f5	big-ip_edge_gateway	10.2.3	Yes
Application	f5	big-ip_edge_gateway	10.2.4	Yes
Application	f5	big-ip_edge_gateway	11.2.1	Yes
Application	f5	big-ip_access_policy_manager	10.2.1	Yes
Application	f5	big-ip_access_policy_manager	10.2.2	Yes
Application	f5	big-ip_access_policy_manager	10.2.3	Yes
Application	f5	big-ip_access_policy_manager	10.2.4	Yes
Application	f5	big-ip_access_policy_manager	11.2.1	Yes
Application	f5	big-ip_access_policy_manager	11.4.0	Yes
Application	f5	big-ip_access_policy_manager	11.4.1	Yes
Application	f5	big-ip_access_policy_manager	11.5.0	Yes
Application	f5	big-ip_access_policy_manager	11.5.1	Yes
Application	f5	big-ip_access_policy_manager	11.5.2	Yes
Application	f5	big-ip_access_policy_manager	11.5.3	Yes
Application	f5	big-ip_access_policy_manager	11.5.4	Yes
Application	f5	big-ip_access_policy_manager	11.6.0	Yes
Application	f5	big-ip_access_policy_manager	12.0.0	Yes

References

http://www.securitytracker.com/id/1036725 Third Party Advisory, VDB Entry ([email protected])
https://support.f5.com/kb/en-us/solutions/public/k/52/sol52638558.html Vendor Advisory ([email protected])
http://www.securitytracker.com/id/1036725 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://support.f5.com/kb/en-us/solutions/public/k/52/sol52638558.html Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For f5's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.