# CVE-2018-11138: Quest KACE System Management Appliance Remote Command Execution Vulnerability

- Exploited (CISA KEV): yes, added 2022-03-25, known ransomware use
- Published: 2018-05-31
- CVSS: 9.8 CRITICAL (v3.1)
- EPSS: 91.7% (100th percentile)
- CWE: CWE-78

The '/common/download_agent_installer.php' script in the Quest KACE System Management Appliance 8.0.318 is accessible by anonymous users and can be abused to execute arbitrary commands on the system.

## 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 | Rule published | 2025-12-03 | 2743 |
| Akamai | No public source | — | — |
| OWASP CRS | Before feed history | — | — |

### F5

- 2025-12-03 · new · rule 200103667
  > Added: signature 200103667 "Quest KACE System Management Remote Code Execution (2)" (Command Execution, risk High), systems: PHP. References: CVE-2018-11138.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog

## Our test (measured)

- OWASP Core Rule Set 4.25.0, paranoia level 1, anomaly threshold 5, default CRS settings: passed (0 of 1 requests blocked), template CVE-2018-11138, 2026-11-02
- OWASP Core Rule Set 4.25.0, paranoia level 2, anomaly threshold 5, default CRS settings: passed (0 of 1 requests blocked), template CVE-2018-11138, 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-2018-11138 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2018-11138