CVE•Published 2021-01-26•Modified 2026-10-09•1 article on news•6 live references•NVD data

CVE-2021-3199Onlyoffice · Document_server

Vulnerability data via NVD (ingested)

CVSS v3.1

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS percentile

Exploit Prediction Scoring System · top 5% of all CVEs

Weaknesses (CWE)

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Description

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.

Timeline

Published 2021-01-26

Modified 2026-10-09

External references

NVD MITRE GitHub PoC Sploitus trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2021-3199

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Onlyoffice Document Server"

All exposed Onlyoffice Document Server instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Document Server"

HTTP body or banner mentions "Document Server" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2021-3199