CVE-2022-21689 - CVE House
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Status published High CVE-2022-21689

Denial of Service in Onionshare

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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CVE-2022-21696
Username spoofing in OnionShare
Medium 4.3
CVE-2022-21695
Improper Access Control in Onionshare
Medium 4.3
CVE-2022-21694
OTF-006: Broken Website Hardening Control: The CSP can be turned on or off but not configured for the specific needs of the website
Low 3.7
CVE-2022-21693
Path traversal in Onionshare
Medium 6.3
CVE-2022-21692
Improper Access Control in Onionshare
Medium 4.3

Affected Vendor

Affected Software

onionshare
Vulnerable Versions:
< 2.5

Timeline

Official Publish: January 18th, 2022
Last Modified: April 23rd, 2025
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

CWE-400

MITRE ATT&CK TTPs

T1499 Endpoint Denial of Service
Impact
T1498 Network Denial of Service
Impact