CVEvulnerability
CVE-2021-39246
6.1 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2021-09-24
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 6.1 MEDIUM — CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- CVSS 2.0 ([email protected])
- 3.6 LOW — AV:L/AC:L/Au:N/C:P/I:P/A:N
- Weaknesses
- CWE-532
Description
Tor Browser through 10.5.6 and 11.x through 11.0a4 allows a correlation attack that can compromise the privacy of visits to v2 onion addresses. Exact timestamps of these onion-service visits are logged locally, and an attacker might be able to compare them to timestamp data collected by the destination server (or collected by a rogue site within the Tor network).
Affected configurations
• torproject tor browser (<= 10.5.6)
• torproject tor browser 11.0
Related
Weakness · CWE (1)
- CWE-532 Insertion of Sensitive Information into Log File weakness
References
- https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.md Exploit, Third Party Advisory
- https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9 Patch, Vendor Advisory
- https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434 Vendor Advisory
- https://sick.codes/sick-2021-111 Exploit, Third Party Advisory
- https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerability Third Party Advisory
- https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.md Exploit, Third Party Advisory
- https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9 Patch, Vendor Advisory
- https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434 Vendor Advisory
- https://sick.codes/sick-2021-111 Exploit, Third Party Advisory
- https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerability Third Party Advisory