What is CVE-2021-3199?

CVE-2021-3199 is a critical-severity vulnerability in Onlyoffice Document_server, classified under Path Traversal. CVSS score: 9.8/10. Published 2021-01-26.

How severe is CVE-2021-3199?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-3199 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Path Traversal in Onlyoffice Document_server

CVE-2021-3199

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.

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.082 (94.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Onlyoffice Document_server
N/a — versions n/a

Weakness classification (CWE)

CWE-22 — Path Traversal

Public proof-of-concept exploits

moehw/poc_

References

cve@mitre.org (x_refsource_CONFIRM, Third Party Advisory, Release Notes)
cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)
cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-3199?: CVE-2021-3199 is a critical-severity vulnerability in Onlyoffice Document_server, classified under Path Traversal. CVSS score: 9.8/10. Published 2021-01-26.
How severe is CVE-2021-3199?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-3199 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.