Critical 9.8Known exploited (CISA KEV)Published Sep 22, 2026

CVE-2026-94127BIG-IP APM OAuth vulnerability

Updated under an hour ago (2026-10-19 04:00 UTC)

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It affects F5 BIG-IP and 1 other product. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Sep 22, 2026; federal agencies had to remediate by Sep 25, 2026. Treat that date as your deadline.

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Exploited in the last 30 days

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: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-122
Known exploited: Added to CISA KEV Sep 22, 2026; federal remediation due Sep 25, 2026Apply 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.
EPSS (exploitation in the next 30 days): 2.23% (percentile 82)
Assigned by: f5
NVD analysis: Analyzed
Record last updated: Sep 23, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

F5 BIG-IP f5:big_ip (from the name)	from 21.1.0 before Hotfix-BIGIP-21.1.0.2.0.30.22-ENG; from 17.5.0 before Hotfix-BIGIP-17.5.1.9.0.160.12-ENG; from 17.1.0 before Hotfix-BIGIP-17.1.3.5.0.41.14-ENG	CNA record
f5 big-ip_access_policy_manager f5:big-ip_access_policy_manager	from 17.0.0 through 17.1.3; from 17.5.0 through 17.5.1; 21.1.0	NVD

References

https://my.f5.com/manage/s/article/K000162605vendor-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-94127us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.