CVE-2016-9256
HighSummary
In F5 BIG-IP versions 12.1.0 through 12.1.2, a race condition can occur that may delay the enforcement of permissions by iControl. If the role_map is not reloaded after permissions are changed, a user may gain access to resources they should not have access to.
Risk Assessment
The organization may be exposed to unauthorized access to resources, potentially leading to data leaks or security breaches. This risk occurs rarely but can have serious consequences.
Recommendation
It is recommended to regularly reload the role map after any permission changes to minimize the risk of this race condition.
Other vulnerabilities in F5 BIG-IP
See all- CVE-2016-9250High
In F5 BIG-IP versions 11.2.1, 11.4.0 through 11.6.1, and 12.0.0 through 12.1.2, an unauthenticated user with access to the control plane may be able to delete arbitrary files through an undisclosed mechanism.
- CVE-2016-9253High
In F5 BIG-IP versions 12.1.0 through 12.1.2, specific websocket traffic patterns may cause a disruption of service for virtual servers configured to use the websocket profile.
- CVE-2016-9251High
In F5 BIG-IP versions 12.0.0 through 12.1.2, an authenticated attacker may gain elevated privileges through a crafted iControl REST connection.
- CVE-2016-9252High
The Traffic Management Microkernel (TMM) in F5 BIG-IP before 11.5.4 HF3, 11.6.x before 11.6.1 HF2 and 12.x before 12.1.2 does not properly handle minimum path MTU options for IPv6, allowing remote attackers to cause a denial-of-service (DoS) through unspecified vectors.
- CVE-2016-5020High
F5 BIG-IP versions before 12.0.0 HF3 allow remote authenticated users to modify the account configuration of users with the Resource Administration role, potentially gaining privileges via a crafted external Extended Application Verification (EAV) monitor script.
- CVE-2016-4545High
Virtual servers in F5 BIG-IP 11.5.4, when SSL profiles are enabled, allow remote attackers to cause a denial of service through resource consumption and Traffic Management Microkernel restart via an SSL alert during the handshake.
- CVE-1999-1550Medium
The bigconf.conf file in F5 BIG/ip version 2.1.2 and earlier allows remote attackers to read arbitrary files by specifying the target file in the 'file' parameter.
- CVE-2026-40629High
A vulnerability in SSL profiles on a virtual server can cause it to stop processing new client connections due to undisclosed traffic. The issue affects software versions that have not reached End of Technical Support.
- CVE-2026-40462Medium
Incorrect permission assignment vulnerabilities exist in iControl REST and TMOS shell (tmsh) undisclosed command, allowing an authenticated attacker to view sensitive information.
- CVE-2026-40423High
A vulnerability in BIG-IP allows termination of the TMM process via undisclosed traffic when a SIP profile is configured on a virtual server. The issue affects F5 Networks software.
Original NVD description (English source)
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.