CVE-2026-94127BIG-IP APM OAuth vulnerability

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.

9.3 CRITICALEPSS 26.55%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-09-23 14:32 UTC

OverviewCVSS details

9.3CRITICALCVSS 4.0

Score source: f5 (CNA)
NVD status: Analyzed
Published: Sep 22, 2026
Assigner: f5

Affected

BIG-IP (F5)

Versions: 21.1.0 before Hotfix-BIGIP-21.1.0.2.0.30.22-ENG · 17.5.0 before Hotfix-BIGIP-17.5.1.9.0.160.12-ENG
Fixed in: 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

All affected versions →

Exploitation

Public exploit: None listed
CISA KEV: Listed · Sep 22, 2026
KEV due date: Sep 25, 2026
Ransomware use: Unknown
SSVC: Exploitation active · Automatable yes · Impact total

EPSS · FIRST, scored Nov 7

26.55%chance of exploitation in 30 days

Higher than 98.02% of CVEs

CVSS 4.0 · f5 (CNA)

9.3Critical

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

Attack vector: Network
Attack complexity: Low
Attack requirements: None
Privileges required: None
User interaction: None
Confidentiality impact: High
Integrity impact: High
Availability impact: High
Confidentiality (other systems): None
Integrity (other systems): None
Availability (other systems): None

CVSS 3.1 · f5 (CNA)

9.8Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
9.3	CRITICAL	4.0f5 (CNA)	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
9.8	CRITICAL	3.1f5 (CNA)	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA required action

⚡ Known exploited · remediation due Sep 25, 2026

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.

Details

CVE ID: CVE-2026-94127
Status: Analyzed
Assigner (CNA): f5
Published: Sep 22, 2026
Last modified: 2026-09-23 14:32 UTC
Weaknesses: CWE-122 · Heap-based Buffer Overflow

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 08:11 UTC.