CVE-2021-25831

PoC —

CVSS 3.1

9.8 critical

EPSS

12%p96

Published

Mar 1, 2021 (Mar 1, 2021)

Modified

Jun 17, 2026

Description

A file extension handling issue was found in [core] module of ONLYOFFICE DocumentServer v4.0.0-9-v5.6.3. An attacker must request the conversion of the crafted file from PPTT into PPTX format. Using the chain of two other bugs related to improper string handling, a remote attacker can obtain remote code execution on DocumentServer.

Vendors: onlyoffice
Products: document server
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (11.5%)

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