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Servers and applications

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…

Severity
High 7.5
Published
9 May 2017
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
1% in the next 30 daysHigher than 64% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
Race condition (CWE-362)
Attack
Over the network · Only under certain conditions · Needs a user account · No user action needed
Attacker can
Read data · Change data · Take it down
CVSS vector
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Sources
NVD

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.

From NVD.

Affected software

SoftwareAffected versions
F5 BIG-IPServers and applications · cpe:a:f5:big-ip_access_policy_manager
  • Version 12.0.0
  • Version 12.1.0
  • Version 12.1.1
  • Version 12.1.2
F5 BIG-IPServers and applications · cpe:a:f5:big-ip_local_traffic_manager
  • Version 12.0.0
  • Version 12.1.0
  • Version 12.1.1
  • Version 12.1.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2016-9256
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2016-9256