# CVE-2021-3199: ONLYOFFICE Docs Server Path Traversal Vulnerability

- Exploited (CISA KEV): yes, added 2026-10-08
- Published: 2021-01-22
- CVSS: 9.8 CRITICAL (v3.1)
- EPSS: 30.2% (98th percentile)
- CWE: CWE-22

Directory traversal with remote code execution can occur in /upload in ONLYOFFICE Document Server before 5.6.3, when JWT is used, via a /.. sequence in an image upload parameter.

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

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Before feed history | — | — |
| AWS | No public claim | — | — |
| 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-2021-3199 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2021-3199