CVE-2021-25833Document Server Path Traversal
A file extension handling issue was found in [server] module of ONLYOFFICE DocumentServer v4.2.0.71-v5.6.0.21.
Published Mar 1, 2021 · Updated Nov 21, 2024
Key Facts
Patch in the next maintenance window- CVE-2021-25833 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Document Server (Onlyoffice).
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 44% probability of exploitation in the next 30 days.
- Fixed versions are available, including Document Server <=5.6.0.21, Document Server 5.6.0.21.
- Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
Scores
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
44%
Higher than 98.7% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
47/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
- advisoryhttps://github.com/ONLYOFFICE/DocumentServer
- advisoryhttps://github.com/ONLYOFFICE/server/blob/v5.6.0.21/DocService/sources/converterservice.js#L200
- advisoryhttps://github.com/ONLYOFFICE/server/blob/v5.6.0.21/FileConverter/sources/converter.js#L283
- advisoryhttps://github.com/ONLYOFFICE/server/blob/v5.6.0.21/FileConverter/sources/converter.js#L593
Description
A file extension handling issue was found in [server] module of ONLYOFFICE DocumentServer v4.2.0.71-v5.6.0.21. The file extension is controlled by an attacker through the request data and leads to arbitrary file overwriting. Using this vulnerability, a remote attacker can obtain remote code execution on DocumentServer.
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Document ServerOnlyoffice | See advisory | 5.6.0.21 |
Patched Releases
Document Server
<=5.6.0.21
Timeline
Publicly disclosed
Mar 1, 2021
Last updated
Nov 21, 2024
Weakness Type
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
References
- advisorygithub.com · DocumentServer
- advisorygithub.com · converterservice.js
- advisorygithub.com · converter.js
- advisorygithub.com · converter.js
- exploitgithub.com · CVE-2021-25833
FAQ
Common Questions.
A file extension handling issue was found in [server] module of ONLYOFFICE DocumentServer v4.2.0.71-v5.6.0.21.
Affected: Document Server (Onlyoffice). The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Document Server <=5.6.0.21, Document Server 5.6.0.21.
Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
Is CVE-2021-25833 On Your Attack Surface?
Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.
Request A Demo