CVE-2021-39246

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

6.1 MEDIUMCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v2.0

3.6 LOWAV:L/AC:L/Au:N/C:P/I:P/A:N

EPSS

0.47% chance of exploitation in the next 30 days, 39th percentile

Published

2021-09-24

Updated

2024-08-04

Proof-of-concept exploits (2)

• sickcodes/security/blob/master/advisories/SICK-2021-111.md
• https://sick.codes/sick-2021-111

References

• CVE Record
• NVD entry

Related

• CVE-2020-25507
• CVE-2020-27402
• CVE-2020-27403
• CVE-2021-28918
• CVE-2021-29662
• CVE-2021-29921