CVE-2020-8516

Public Exploit

Description

The daemon in Tor through 0.4.1.8 and 0.4.2.x through 0.4.2.6 does not verify that a rendezvous node is known before attempting to connect to it, which might make it easier for remote attackers to discover circuit information. NOTE: The network team of Tor claims this is an intended behavior and not a vulnerability

5.3

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 1.25% Top 25%

Vendor Advisory torproject.org Vendor Advisory torproject.org Vendor Advisory torproject.org

Affected: n/a n/a

References

Link	Tags
https://www.hackerfactor.com/blog/index.php?/archives/868-Deanonymizing-Tor-Circuits.html	exploit mitigation third party advisory technical description
https://lists.torproject.org/pipermail/tor-dev/2020-February/014147.html	vendor advisory mailing list
https://security-tracker.debian.org/tracker/CVE-2020-8516	third party advisory
https://lists.torproject.org/pipermail/tor-dev/2020-February/014146.html	vendor advisory mailing list
https://trac.torproject.org/projects/tor/ticket/33129	vendor advisory issue tracking

Frequently Asked Questions

What is the severity of CVE-2020-8516?: CVE-2020-8516 has been scored as a medium severity vulnerability.
How to fix CVE-2020-8516?: To fix CVE-2020-8516, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-8516 being actively exploited in the wild?: It is possible that CVE-2020-8516 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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