Critical [CVE-2026-94127] 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 critical-severity F5 advisory covers CVE-2026-94127 affecting BIG-IP.
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Summary
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.
CISA Known Exploited Vulnerability
- Listed:
- Sep 22, 2026 · federal remediation due Sep 25, 2026
- Required action:
- 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.
- Ransomware use:
- Unknown
KEV is a prioritization signal from CISA — remediation detail still comes from the vendor advisory.
- BIG-IP 21.1.0 before Hotfix-BIGIP-21.1.0.2.0.30.22-ENG
- BIG-IP 17.5.0 before Hotfix-BIGIP-17.5.1.9.0.160.12-ENG
- BIG-IP 17.1.0 before Hotfix-BIGIP-17.1.3.5.0.41.14-ENG
Official advisory · high-confidence parse· fetched 19 days ago·verify at source
- Hotfix-BIGIP-21.1.0.2.0.30.22-ENG
- Hotfix-BIGIP-17.5.1.9.0.160.12-ENG
- Hotfix-BIGIP-17.1.3.5.0.41.14-ENG
Official advisory · high-confidence parse· fetched 19 days ago·verify at source
Mitigation
Upgrade to a fixed release: Hotfix-BIGIP-21.1.0.2.0.30.22-ENG, Hotfix-BIGIP-17.5.1.9.0.160.12-ENG, Hotfix-BIGIP-17.1.3.5.0.41.14-ENG. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 19 days ago·verify at source
Discussion(0)
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