CVE-2020-8516: Medium severity torproject Tor vulnerability

Published Feb 2, 2020
·
Updated

DISPUTED 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.

Affected Software

3 affected components
torproject Tor<=0.4.1.8
torproject Tor>=0.4.2.0<=0.4.2.6
debian/tor<=0.4.5.16-1, <=0.4.9.8-0+deb12u1, <=0.4.9.11-0+deb12u1, <=0.4.9.8-0+deb13u1, <=0.4.9.11-0+deb13u1, <=0.4.9.11-1

Event History

Feb 2, 2020
CVE Published
via MITRE·12:52 PM
Data Sourced
via MITRE·12:52 PM
Description
Disputed
01:15 PM
Data Sourced
via NVD·01:15 PM
DescriptionSeverityAffected Software
Jul 3, 2026
Data Sourced
via Debian·03:45 AM
DescriptionAffected Software
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Frequently Asked Questions

1

What is CVE-2020-8516?

CVE-2020-8516 is a vulnerability in the Tor daemon that allows remote attackers to discover circuit information.

2

What is the severity of CVE-2020-8516?

The severity of CVE-2020-8516 is medium with a CVSS score of 5.3.

3

How does CVE-2020-8516 affect Tor?

CVE-2020-8516 affects Tor versions 0.4.1.8 and 0.4.2.x through 0.4.2.6.

4

What is the remedy for CVE-2020-8516?

There is currently no remedy available for CVE-2020-8516. It is advised to update to a patched version when it becomes available.

5

Where can I find more information about CVE-2020-8516?

You can find more information about CVE-2020-8516 at the following references: [Link 1](https://lists.torproject.org/pipermail/tor-dev/2020-February/014146.html), [Link 2](https://lists.torproject.org/pipermail/tor-dev/2020-February/014147.html), [Link 3](https://security-tracker.debian.org/tracker/CVE-2020-8516).

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