Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Onlyoffice | Document Server | >= 4.2.0.71, <= 5.6.0.21 |
Related Weaknesses (CWE)
References
- https://github.com/ONLYOFFICE/DocumentServerProductVendor Advisory
- https://github.com/ONLYOFFICE/serverProduct
- https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/DocService/sources/converterThird Party Advisory
- https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/FileConverter/sources/converThird Party Advisory
- https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/FileConverter/sources/converThird Party Advisory
- https://github.com/merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25833ExploitThird Party Advisory
- https://github.com/ONLYOFFICE/DocumentServerProductVendor Advisory
- https://github.com/ONLYOFFICE/serverProduct
- https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/DocService/sources/converterThird Party Advisory
- https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/FileConverter/sources/converThird Party Advisory
- https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/FileConverter/sources/converThird Party Advisory
- https://github.com/merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25833ExploitThird Party Advisory
FAQ
What is CVE-2021-25833?
CVE-2021-25833 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 arb...
How severe is CVE-2021-25833?
CVE-2021-25833 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2021-25833?
Check the references section above for vendor advisories and patch information. Affected products include: Onlyoffice Document Server.