CVE-2022-21689 HIGH

CVE-2022-21689: Denial of Service in Onionshare

Vendor Onionshare
Product onionshare
Weakness CWE-400
Published January 18, 2022
Last update April 23, 2025

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

OnionShare is an open source tool that lets you securely and anonymously share files, host websites, and chat with friends using the Tor network. In affected versions the receive mode limits concurrent uploads to 100 per second and blocks other uploads in the same second, which can be triggered by a simple script. An adversary with access to the receive mode can block file upload for others. There is no way to block this attack in public mode due to the anonymity properties of the tor network.

Key dates

02Disclosure timeline

January 18, 2022 CVE published
April 23, 2025 Record updated