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CVE-2020-8516

MEDIUM
5.3
CVSS Score
Published: February 2, 2020 at 12:52 PM UTC
Updated: June 17, 2026 at 03:26 AM UTC
1 product affected across 1 vendorTor

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Severity
MEDIUM5.3
Exploit prediction
EPSS 2%

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Tor· Torproject
95%
v ≤ 0.4.1.80.4.2.0 ≤ v ≤ 0.4.2.6

References (5)

x_refsource_MISCMailing ListVendor Advisory
Source: [email protected]
https://lists.torproject.org/pipermail/tor-dev/2020-February/014146.html
x_refsource_MISCMailing ListVendor Advisory
Source: [email protected]
https://lists.torproject.org/pipermail/tor-dev/2020-February/014147.html
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://security-tracker.debian.org/tracker/CVE-2020-8516
x_refsource_MISCIssue TrackingVendor Advisory
Source: [email protected]
https://trac.torproject.org/projects/tor/ticket/33129
x_refsource_MISCExploitMitigationTechnical DescriptionThird Party Advisory
Source: [email protected]
https://www.hackerfactor.com/blog/index.php?/archives/868-Deanonymizing-Tor-Circuits.html

CVSS

5.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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