CVE-2026-94127criticalunder attackCWE-122

CVE-2026-94127: critical vulnerability in F5 BIG-IP

BIG-IP APM OAuth vulnerability

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83Vexday Risk Score

Prioritize patching. It under exploitation confirmed by CISA, has an official Brazilian government alert and has a public proof of concept.

ssvc Actcvss 9.3epss 27%
from disclosure to weapon1 day
Published on NVDSep 22
1st PoC+1d
CISA KEVSep 22
Official alert in Brazil

Brazil's federal government published an alert, recommendation or bulletin that cites this vulnerability.

Source: CTIR Gov (GSI) and CISC Gov.br, under the CC BY-ND 3.0 license.
Action required by CISAfederal deadline: 2026-09-25

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

In short

A flaw in F5 BIG-IP APM's OAuth setup allows attackers to run malicious code remotely without needing a password, potentially compromising the entire system.

Technical detail

When BIG-IP APM access policies and OAuth profiles are enabled on a virtual server, unauthenticated attackers can craft specific traffic patterns to achieve remote code execution in the data plane without control plane interaction.

Summary generated and translated by AI from the official description.
When a BIG-IP APM access policy and an OAuth profile are configured on a virtual server, specific malicious traffic can lead to remote code execution (RCE). This vulnerability is only present when BIG-IP APM is configured as an OAuth Authorization Server. Deployments using APM strictly as an OAuth Client / Resource Server (without OAuth authorization server profiles configured) are not affected by this vulnerability. Impact: This vulnerability allows an unauthenticated attacker to perform remote code execution. The BIG-IP system in Appliance mode is also vulnerable. This is a data plane issue; there is no control plane exposure. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
F5 · BIG-IP
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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