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CVE-2026-94127

F5 BIG-IP APM•CRITICAL · CVSS 9.8• In the wild In CISA KEV

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.

CVSS9.8 NVD 3.1

SeverityCRITICAL

Exploitation In the wild In CISA KEV

EPSS27% · P98

Triage statusActive Exploit

ActionPatch immediately

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

CWECWE-122

NVD published2026-09-22

NVD last modified2026-09-23

Timeline

2026-09-22Published to the U.S. National Vulnerability Database (NVD)
2026-09-22Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
2026-09-23NVD record last updated
2026-09-25First covered in a defend.network daily briefing
2026-09-25CISA federal remediation deadline (BOD 22-01)

CISA Known Exploited Vulnerability

F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability

Added to KEV2026-09-22

Federal patch deadline2026-09-25

Known ransomware useUnknown

Affected product

F5 BIG-IP APM

Remediation Steps

Apply the vendor security update for F5 BIG-IP APM as a priority.
Restrict network exposure of the affected service to trusted sources until patched.
Review logs and detections for indicators of exploitation.
Confirm fixed versions against the official vendor advisory before deploying.

References

Referenced in our briefings & reports

Vulnerability Priority Report – Week 3 of October 2026 (October 19 – 25)
Vulnerability Priority Report – Week 2 of October 2026 (October 12 – 18)
Vulnerability Priority Report – Week 1 of October 2026 (October 5 – 11)
Vulnerability Priority Report – Week 4 of September 2026 (September 28 – October 4)
Vulnerability Priority Report – Week 3 of September 2026 (September 21 – 27)
Microsoft, WSO2, Adobe vulnerabilities under active exploitation; Roundcube actively abused (2026-09-25)

Related vulnerabilities

CVE-2025-53521 – F5 BIG-IP (same product)
CVE-2026-42945 – F5 Nginx (same vendor)
CVE-2026-76471 (same weakness: CWE-122)
CVE-2026-85103 (same weakness: CWE-122)
CVE-2026-69829 – Microsoft Windows (same weakness: CWE-122)
CVE-2026-85880 – Microsoft Windows (same weakness: CWE-122)

Browse all tracked CVEs in the defend.network CVE database →

🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.