CVSS 3.1
6.1 mediumCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NCVE-2021-39246
Medium (6.1) in torproject tor browser. EPSS 0.5% chance of exploitation in the next 30 days.
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).
Severity
- EPSS
- 0.5% chance of exploitation in the next 30 days; higher than 41% of CVEs (scores of 2026-10-31)
- CWE
- CWE-532
- Published
- Modified
- Record from
- the NVD, synced
Affected
- torproject:tor_browser
References
- https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.md
- https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9
- https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434
- https://sick.codes/sick-2021-111
- https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerability