CVE-2021-25831 is a critical remote code execution vulnerability affecting ONLYOFFICE DocumentServer versions 4.0.0-9 through 5.6.3. It stems from a file extension handling issue within the core module, which, when combined with two string handling bugs, allows an attacker to achieve RCE by requesting the conversion of a specially crafted PPTT file to PPTX format. With a CVSS score of 9.8, this vulnerability is easily exploitable over the network without user interaction, leading to complete compromise of confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 4.0.0-9, <= 5.6.3CPE matchmatch criteria | cpe:2.3:a:onlyoffice:document_server:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.