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Case File

CVE-2021-25833

CRITICAL · CVSS 9.8 EPSS 43.53% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-03-01 · Last synced 2026-08-04

CyberRota Analysis

This is a critical severity vulnerability with a CVSS score of 9.8. It affects Office. Public exploit code or proof-of-concept references have been detected in its references. Its EPSS score suggests a 43.5% probability of exploitation in the next 30 days. It may be remotely exploitable.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
remote code execution code execution

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2021-25833
Severity
CRITICAL
CVSS
9.8
EPSS
43.53%
Office

Original NVD 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.

Related CVEs

Other vulnerabilities affecting the same vendor(s)