Medium severity6.1NVD Advisory· Published Sep 24, 2021· Updated Jun 17, 2026
CVE-2021-39246
CVE-2021-39246
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).
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
5cpe:2.3:a:torproject:tor_browser:*:*:*:*:*:*:*:*+ 3 more
- cpe:2.3:a:torproject:tor_browser:*:*:*:*:*:*:*:*range: <=10.5.6
- cpe:2.3:a:torproject:tor_browser:11.0:alpha2:*:*:*:*:*:*
- cpe:2.3:a:torproject:tor_browser:11.0:alpha4:*:*:*:*:*:*
- (no CPE)range: <=10.5.6, <=11.0a4
- Tor Project/Tor Browserdescription
Patches
Vulnerability mechanics
References
5- gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9nvdPatchVendor Advisory
- github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.mdnvdExploitThird Party Advisory
- sick.codes/sick-2021-111nvdExploitThird Party Advisory
- gitlab.torproject.org/tpo/core/tor/-/merge_requests/434nvdVendor Advisory
- www.privacyaffairs.com/cve-2021-39246-tor-vulnerabilitynvdThird Party Advisory
News mentions
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