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ExploitedIn CISA KEV

CVE-2026-94127

BIG-IP APM OAuth vulnerability

Exploitation confirmed. First attested on 2026-09-22 by CISA-ADP, CISA KEV, GCVE · enisa-cnw-kev, GCVE · previdian.

  • Published2026-09-22
  • WeaknessCWE-122

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-09-22Added to the CISA KEV catalogCISA KEV
  2. 2026-09-22Listed as exploited by GCVEGCVE
  3. 2026-09-22Exploitation first reportedCISA KEV
  4. 2026-09-2215:17CVE publishedNVD
  5. 2026-09-2219:40SSVC exploitation set to activeCISA-ADP
  6. 2026-10-2523:12EPSS crossed 10 %FIRST EPSS

Versions per branch

NVD
F5 big-ip access policy manager
BranchAffectedFixed in
17.x≥ 17.0.0, ≤ 17.1.3no fix published
17.5≥ 17.5.0, ≤ 17.5.1no fix published
21.1= 21.1.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As f5, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • F5 BIG-IPother versions: unknown
    Affected
    • ≥ 21.1.0, < Hotfix-BIGIP-21.1.0.2.0.30.22-ENGfixed in Hotfix-BIGIP-21.1.0.2.0.30.22-ENGcustom
    • ≥ 17.5.0, < Hotfix-BIGIP-17.5.1.9.0.160.12-ENGfixed in Hotfix-BIGIP-17.5.1.9.0.160.12-ENGcustom
    • ≥ 17.1.0, < Hotfix-BIGIP-17.1.3.5.0.41.14-ENGfixed in Hotfix-BIGIP-17.1.3.5.0.41.14-ENGcustom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-09-23

Fix

  1. CISA’s 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.due 2026-09-25

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2026-09-22
Patch Due Date
2026-09-25
Ransomware Use
Unknown
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.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 4.0 vector
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-09-22
Last Modified
2026-09-23
NVD status
Analyzed
GitHub Advisory
GHSA-qppv-6jrg-hxq4

Frequently asked questions

What is 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 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.

Is CVE-2026-94127 actively exploited?

Yes. CVE-2026-94127 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-09-25.

What is the CVSS score for CVE-2026-94127?

CVE-2026-94127 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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