CVE-2021-25831

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.

CVSS v3.1

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0

7.5 HIGHAV:N/AC:L/Au:N/C:P/I:P/A:P

EPSS

11.50% chance of exploitation in the next 30 days, 96th percentile

Published

2021-03-01

Updated

2024-08-03

Proof-of-concept exploits (1)

• merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25831

References

• CVE Record
• NVD entry

Related

• CVE-2020-13898
• CVE-2020-13899
• CVE-2020-13900
• CVE-2020-13901
• CVE-2021-25829
• CVE-2021-25830