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.

CVSS v3.1 NVD

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

CVSS v2.0 NVD

7.5 HIGHAV:N/AC:L/Au:N/C:P/I:P/A:P

EPSS

20.14% chance of exploitation in the next 30 days, 97th percentile

CISA KEV

added 2026-10-08

Published

2021-01-22

Updated

2026-10-09

Proof-of-concept exploits (2)

• moehw/poc_exploits26★ · 2024-11-12
• nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.py26★ · 2024-11-12

Security advisories

• ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563
• moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py

References

• CVE Record
• NVD entry

Related

• CVE-2022-29776
• CVE-2022-29777
• CVE-2023-28488