# CVE-2014-3931: Multi-Router Looking Glass (MRLG) Buffer Overflow Vulnerability

- Exploited (CISA KEV): yes, added 2025-07-07
- Published: 2017-03-31
- CVSS: 9.8 CRITICAL (v3.1)
- EPSS: 29.0% (98th percentile)
- CWE: CWE-119

fastping.c in MRLG (aka Multi-Router Looking Glass) before 5.5.0 allows remote attackers to cause an arbitrary memory write and memory corruption.

## 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 | — | — |

"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-2014-3931 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2014-3931