Vulnerability · Published Sep 24, 2021 · Assigned by mitre
CVE-2021-39246
Medium 6.1
In plain English
A medium-severity security flaw in the affected software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities).
Severity (CVSS NVD)6.1Medium
Exploit odds (30 days)0.5%top 58.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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 products (as reported)
References
- https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.md x_refsource_MISC
- https://sick.codes/sick-2021-111 x_refsource_MISC
- https://www.privacyaffairs.com/cve-2021-39246-tor-vulnerability x_refsource_MISC
- https://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9 x_refsource_MISC
- https://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434 x_refsource_MISC