# CVE-2019-11043: PHP FastCGI Process Manager (FPM) Buffer Overflow Vulnerability

- Exploited (CISA KEV): yes, added 2022-03-25, known ransomware use
- Published: 2019-10-28
- CVSS: 8.7 HIGH (v3.1)
- EPSS: 99.8% (100th percentile)
- CWE: CWE-120

In PHP versions 7.1.x below 7.1.33, 7.2.x below 7.2.24 and 7.3.x below 7.3.11 in certain configurations of FPM setup it is possible to cause FPM module to write past allocated buffers into the space reserved for FCGI protocol data, thus opening the possibility of remote code execution.

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

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

## Our test (measured)

- OWASP Core Rule Set 4.25.0, paranoia level 1, anomaly threshold 5, default CRS settings: blocked (2 of 2 requests blocked), template CVE-2019-11043, 2026-11-02
- OWASP Core Rule Set 4.25.0, paranoia level 2, anomaly threshold 5, default CRS settings: blocked (2 of 2 requests blocked), template CVE-2019-11043, 2026-11-02

"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-2019-11043 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2019-11043