CVE-2021-39246
MEDIUM 6.1EPSS 0.5%
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).
- CVSS v3.1 NVD
- 6.1 MEDIUM
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - CVSS v2.0 NVD
- 3.6 LOW
AV:L/AC:L/Au:N/C:P/I:P/A:N - EPSS
- 0.47% chance of exploitation in the next 30 days, 40th percentile
- Published
- 2021-09-24
- Updated
- 2024-08-04
Proof-of-concept exploits (2)
- sickcodes/security/blob/master/advisories/SICK-2021-111.md92★ · 2022-07-29
- https://sick.codes/sick-2021-111
Security advisories
- https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3…
- https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434
- https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerability