# CVE-2026-94127: F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability

- Exploited (CISA KEV): yes, added 2026-09-22
- Published: 2026-09-22
- CVSS: 9.3 CRITICAL (v4.0)
- EPSS: 26.6% (98th percentile)
- CWE: CWE-122

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.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Blocks by default | 2026-10-06 | 14 |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | Before feed history | — | — |
| F5 | No public claim | — | — |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

### Cloudflare

- 2026-10-06 · new · rule f0c31de76290471e842c77ca7206c737 · default Block
  > F5 BIG-IP - UnAuth Heap-Overflow - CVE:CVE-2026-94127. Previous action: Log. New action: Block. This is a new detection.
  Source: https://developers.cloudflare.com/changelog/post/2026-10-06-waf-release/

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2026-94127 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2026-94127