VulnerabilityModified
CVE-2021-25833
The file extension is controlled by an attacker through the request data and leads to arbitrary file overwriting.
CRITICAL 9.8EPSS 43.5%
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 43.5%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
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 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 43.53% probability · 99th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-22
- Affected
- onlyoffice/document server
- Source
- cve@mitre.org
References
- https://github.com/ONLYOFFICE/DocumentServerProduct, Vendor Advisory
- https://github.com/ONLYOFFICE/serverProduct
- https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/DocService/sources/converterservice.js#L200Third Party Advisory
- https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/FileConverter/sources/converter.js#L283Third Party Advisory
- https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/FileConverter/sources/converter.js#L593Third Party Advisory
- https://github.com/merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25833Exploit, Third Party Advisory
- https://github.com/ONLYOFFICE/DocumentServerProduct, Vendor Advisory
- https://github.com/ONLYOFFICE/serverProduct
- https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/DocService/sources/converterservice.js#L200Third Party Advisory
- https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/FileConverter/sources/converter.js#L283Third Party Advisory
- https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/FileConverter/sources/converter.js#L593Third Party Advisory
- https://github.com/merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25833Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.