HackZoneLabs News
Newsletter

CVE-2026-94127

BIG-IP APM OAuth vulnerability

  • Critical 9.8
  • Exploited: added to CISA KEV 22 Sep 2026

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.

Key facts

Published
22 Sep 2026
Last changed
23 Sep 2026
Assigned by
f5
KEV added
22 Sep 2026
KEV fix due
25 Sep 2026
EPSS
26.55% likely to be exploited in the next 30 days, higher than 98.044% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.8CVSS 3.1, Criticalfrom the CNA (f5)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • 9.3CVSS 4.0, Criticalfrom the CNA (f5)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

What to do

  • An iRule is available upon request. Open a ticket with F5 support to request this.CNA workaround statement
  • 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.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

CAPEC-100 Overflow Buffers (CNA impact statement)

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
F5BIG-IP
  • Default status: unknown
  • 21.1.0 up to but excluding Hotfix-BIGIP-21.1.0.2.0.30.22-ENG (affected)
  • 17.5.0 up to but excluding Hotfix-BIGIP-17.5.1.9.0.160.12-ENG (affected)
  • 17.1.0 up to but excluding Hotfix-BIGIP-17.1.3.5.0.41.14-ENG (affected)

Timeline

  1. 22 Sep 2026 CVE-2026-94127 added to CISA KEV
  2. 22 Sep 2026 Added to the CISA KEV catalogue
  3. 22 Sep 2026 Published

Weakness

References