VulnerabilityModified
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.
MEDIUM 6.1EPSS 0.47%
Does this matter?
Lower severity and a low EPSS score (0.47%). Track it; it rarely justifies an emergency change on its own.
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).
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- EPSS
- 0.47% probability · 40th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-532
- Affected
- torproject/tor browser
- Source
- cve@mitre.org
References
- https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.mdExploit, Third Party Advisory
- https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9Patch, Vendor Advisory
- https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434Vendor Advisory
- https://sick.codes/sick-2021-111Exploit, Third Party Advisory
- https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerabilityThird Party Advisory
- https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.mdExploit, Third Party Advisory
- https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9Patch, Vendor Advisory
- https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434Vendor Advisory
- https://sick.codes/sick-2021-111Exploit, Third Party Advisory
- https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerabilityThird Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.