CVE-2021-25831: onlyoffice document server

csirt@kutim:~/threat-intel/cve/CVE-2021-25831

CVSS 9.8 · Critical EPSS 11,5%

Kerentanan pada onlyoffice document server. Skor CVSS 3.1 9.8 (Critical) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD: 1 Maret 2021
Terakhir diubah: 17 Juni 2026
Status NVD: Modified
CVSS 3.1: 9.8 (Critical), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator
EPSS (30 hari): 11,5% peluang dieksploitasi; lebih tinggi dari 95,9% CVE lain

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
onlyoffice	document server	Versi 4.0.0-9 hingga 5.6.3

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

https://github.com/ONLYOFFICE/core product · advisory vendor
https://github.com/ONLYOFFICE/core/blob/v5.6.4.13/ASCOfficePPTXFile/Editor/BinaryFileReaderWriter.cpp#L1918 advisory vendor
https://github.com/ONLYOFFICE/core/blob/v5.6.4.13/ASCOfficePPTXFile/Editor/BinaryFileReaderWriter.cpp#L241 advisory vendor
https://github.com/ONLYOFFICE/core/blob/v5.6.4.13/ASCOfficePPTXFile/PPTXFormat/Logic/Fills/BlipFill.cpp#L328 advisory vendor
https://github.com/merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25831 exploit · advisory vendor
https://github.com/ONLYOFFICE/DocumentServer product

Sumber: NVD · CVE.org · EPSS. Halaman ini disusun otomatis dari data tersebut; pembaruan terakhir 5 Okt 2026, 20:10 WITA. Kalau sistem di Perangkat Daerah memakai produk ini dan butuh bantuan, laporkan lewat kanal pelaporan.