CVE-2021-39246 affects Tor Browser versions through 10.5.6 and 11.x through 11.0a4 on Apple, Linux, and Microsoft platforms. This vulnerability allows a correlation attack where an attacker can compromise the privacy of v2 onion address visits by comparing locally logged exact timestamps with data collected by a destination server or rogue Tor network site. Rated as Medium severity (CVSS 6.1), the attack requires physical access (AV:P) but is low complexity (AC:L) and can lead to high confidentiality and integrity impacts (C:H/I:H). There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or KEV listing, though it has received minimal community discussion.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 10.5.6CPE matchmatch criteria | cpe:2.3:a:torproject:tor_browser:*:*:*:*:*:*:*:* | ||
11.0CPE matchmatch criteria | cpe:2.3:a:torproject:tor_browser:11.0:alpha2:*:*:*:*:*:* | ||
11.0CPE matchmatch criteria | cpe:2.3:a:torproject:tor_browser:11.0:alpha4:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.