CVE-2021-39246 Information disclosure in n/a
Tor Browser logs exact timestamps for onion service visits, allowing attackers to correlate data and compromise user privacy.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-39246?
CVE-2021-39246 is a medium-severity vulnerability in n/a, published on 24 Sep 2021. It can only be exploited from the same machine or local network, with no action from the victim.
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).
Weakness: CWE-532
Which versions are affected by CVE-2021-39246?
It affects 1 product.
Products include Torproject Tor Browser.
How do I fix CVE-2021-39246?
No fix has been published for CVE-2021-39246 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-39246 being exploited?
There is no known exploitation of CVE-2021-39246 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-mqmf-5457-4f39.