Vulnerability · Published Mar 1, 2021 · Assigned by mitre
CVE-2021-25833
Critical 9.8
In plain English
A critical-severity security flaw in the affected software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 43.5% (higher than 99% of all known vulnerabilities).
Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)43.5%top 1.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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 (as reported)
References
- https://github.com/ONLYOFFICE/DocumentServer x_refsource_MISC
- https://github.com/ONLYOFFICE/server x_refsource_MISC
- https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/DocService/sources/converterservice.js#L200 x_refsource_MISC
- https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/FileConverter/sources/converter.js#L593 x_refsource_MISC
- https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/FileConverter/sources/converter.js#L283 x_refsource_MISC
- https://github.com/merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25833 x_refsource_MISC