CVE-2016-9256: F5 Networks, Inc. BIG-IP vulnerability

CVE-2016-9256: In F5 BIG-IP 12.1.0 through 12.1.2, permissions enforced by iControl can lag behind the actual permissions...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 02:42 UTC (UTC+00:00)

Security readout for executives and security teams

This flaw can briefly leave F5 BIG-IP iControl permissions out of sync after a user's role changes. For a few seconds, a user may be treated under old permissions. It is described as rare in normal use, but it matters where BIG-IP administration is tightly controlled. Exposure is limited to BIG-IP deployments running versions 12.1.0 through 12.1.2 with iControl users whose permissions are changed while they can still make requests. Treat this as a targeted administrative-control issue, not a broad internet worm risk based on available evidence. Prioritize if affected BIG-IP systems manage sensitive traffic or have shared administrative access. Mitigation focus: Inventory BIG-IP systems and identify any 12.1.0 through 12.1.2 deployments.; Review F5 advisory K47284724 for vendor-confirmed fixes or operational workarounds.; Restrict iControl access to trusted administrative networks and accounts..

Prepared: Jun 13, 2026, 05:01 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: May 9, 2017, 15:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://support.f5.com/csp/article/K47284724CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

F5 Networks, Inc.BIG-IP12.1.0-12.1.2Listed

Weakness

CWE details

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