CVE-2021-3199
ONLYOFFICE Document Server Remote Code Execution Vulnerability via Directory 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.
INFO
Published Date :
Jan. 26, 2021, 6:16 p.m.
Last Modified :
Oct. 8, 2026, 6:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 2.0 | HIGH | [email protected] | ||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 3.1 | CRITICAL | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Public PoC/Exploit Available at Github
CVE-2021-3199 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-3199.
| URL | Resource |
|---|---|
| https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563 | Release Notes Third Party Advisory |
| https://github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py | Exploit Third Party Advisory |
| https://github.com/nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.py | Exploit Third Party Advisory |
| https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563 | Release Notes Third Party Advisory |
| https://github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py | Exploit Third Party Advisory |
| https://github.com/nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.py | Exploit Third Party Advisory |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-3199 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-3199 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-3199
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
🕳️ Proof of Concept exploits and their descriptions for various products
cve poc exploit exploits
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-3199 vulnerability anywhere in the article.
-
The Hacker News
FBI Says China-Linked Hackers Ran Portal Giving Third Parties Access to Stolen Emails
Hackers tied to a Chinese cybersecurity company stole email from government organizations, law enforcement agencies, healthcare systems, and religious institutions in Southeast Asia, the FBI and agenc ... Read more
The following table lists the changes that have been made to the
CVE-2021-3199 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725
Oct. 08, 2026
Action Type Old Value New Value Added Date Added 2026-10-08 Added Due Date 2026-10-08 Added Required Action 2026-10-08 Added Vulnerability Name 2026-10-08 -
CVE Modified by [email protected]
Oct. 08, 2026
Action Type Old Value New Value Added Reference https://github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py Added Reference https://github.com/nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.py Added Reference https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563 Removed Reference https://github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py Removed Reference https://github.com/nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.py Removed Reference https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563 Removed Reference Type https://github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py Types: Exploit, Third Party Advisory Removed Reference Type https://github.com/nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.py Types: Exploit, Third Party Advisory Removed Reference Type https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563 Types: Release Notes, Third Party Advisory -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Oct. 08, 2026
Action Type Old Value New Value Added Reference https://github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py Added Reference https://github.com/nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.py Added Reference https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563 Removed Reference https://github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py Removed Reference https://github.com/nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.py Removed Reference https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563 Removed Reference Type https://github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py Types: Exploit, Third Party Advisory Removed Reference Type https://github.com/nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.py Types: Exploit, Third Party Advisory Removed Reference Type https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563 Types: Release Notes, Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 08, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-22 Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-3199 Added SSVC {'id': 'CVE-2021-3199', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-10-08T17:40:14.811565Z'} -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'n/a', 'product': 'n/a', 'versions': [{'status': 'affected', 'version': 'n/a'}]}] -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py Added Reference https://github.com/nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.py Added Reference https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563 -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Apr. 15, 2022
Action Type Old Value New Value Changed Reference Type https://github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py No Types Assigned https://github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py Exploit, Third Party Advisory -
CVE Modified by [email protected]
Mar. 21, 2022
Action Type Old Value New Value Added Reference https://github.com/moehw/poc_exploits/tree/master/CVE-2021-3199/poc_uploadImageFile.py [No Types Assigned] -
Initial Analysis by [email protected]
Feb. 03, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://github.com/nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.py No Types Assigned https://github.com/nola-milkin/poc_exploits/blob/master/CVE-2021-3199/poc_uploadImageFile.py Exploit, Third Party Advisory Changed Reference Type https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563 No Types Assigned https://github.com/ONLYOFFICE/DocumentServer/blob/903fe5ab7a275bd69c3c3346af2d21cf87ebeabf/CHANGELOG.md#563 Release Notes, Third Party Advisory Added CWE NIST CWE-22 Added CPE Configuration OR *cpe:2.3:a:onlyoffice:document_server:*:*:*:*:*:*:*:* versions up to (excluding) 5.6.3