Critical severity9.8NVD Advisory· Published Jan 26, 2021· Updated Jun 17, 2026
CVE-2021-3199
CVE-2021-3199
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3- ONLYOFFICE/Document Serverdescription
- Range: <5.6.3
Patches
Vulnerability mechanics
References
3- github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.pynvdExploitThird Party Advisory
- github.com/nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.pynvdExploitThird Party Advisory
- github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.mdnvdRelease NotesThird Party Advisory
News mentions
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