CVE-2016-9256
CVE-2016-9256 is a high-severity vulnerability in F5 Big-ip Local Traffic Manager with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-362.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v2: 6.0
- EPSS exploit prediction: 1% (60th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-362
- Affected product: F5 Big-ip Local Traffic Manager
- Published:
- Last modified:
Description
In F5 BIG-IP 12.1.0 through 12.1.2, permissions enforced by iControl can lag behind the actual permissions assigned to a user if the role_map is not reloaded between the time the permissions are changed and the time of the user's next request. This is a race condition that occurs rarely in normal usage; the typical period in which this is possible is limited to at most a few seconds after the permission change.
Frequently asked questions
- What is CVE-2016-9256?
- In F5 BIG-IP 12.1.0 through 12.1.2, permissions enforced by iControl can lag behind the actual permissions assigned to a user if the role_map is not reloaded between the time the permissions are changed and the time of the user's next request. This is a race condition that occurs rarely in normal usage; the typical period in which this is possible is limited to at most a few seconds after the permission change.
- How severe is CVE-2016-9256?
- CVE-2016-9256 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2016-9256 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2016-9256?
- CVE-2016-9256 primarily affects F5 Big-ip Local Traffic Manager. In total, 40 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2016-9256?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2016-9256 published?
- CVE-2016-9256 was published on 2017-05-09 and last updated on 2026-06-17.
References
Affected products (40)
- cpe:2.3:a:f5:big-ip_local_traffic_manager:12.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_local_traffic_manager:12.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_local_traffic_manager:12.1.1:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_local_traffic_manager:12.1.2:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_application_acceleration_manager:12.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_application_acceleration_manager:12.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_application_acceleration_manager:12.1.1:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_application_acceleration_manager:12.1.2:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_advanced_firewall_manager:12.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_advanced_firewall_manager:12.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_advanced_firewall_manager:12.1.1:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_advanced_firewall_manager:12.1.2:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_analytics:12.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_analytics:12.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_analytics:12.1.1:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_analytics:12.1.2:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_access_policy_manager:12.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_access_policy_manager:12.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_access_policy_manager:12.1.1:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_access_policy_manager:12.1.2:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_application_security_manager:12.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_application_security_manager:12.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_application_security_manager:12.1.1:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_application_security_manager:12.1.2:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_domain_name_system:12.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_domain_name_system:12.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_domain_name_system:12.1.1:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_domain_name_system:12.1.2:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_link_controller:12.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_link_controller:12.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_link_controller:12.1.1:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_link_controller:12.1.2:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_policy_enforcement_manager:12.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_policy_enforcement_manager:12.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_policy_enforcement_manager:12.1.1:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_policy_enforcement_manager:12.1.2:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_websafe:12.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_websafe:12.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_websafe:12.1.1:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_websafe:12.1.2:*:*:*:*:*:*:*
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