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CVE
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CVE-2020-8516Date: (C)2020-02-03   (M)2024-04-19


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

CVSS Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 5.3CVSS Score : 5.0
Exploit Score: 3.9Exploit Score: 10.0
Impact Score: 1.4Impact Score: 2.9
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: NETWORKAccess Vector: NETWORK
Attack Complexity: LOWAccess Complexity: LOW
Privileges Required: NONEAuthentication: NONE
User Interaction: NONEConfidentiality: PARTIAL
Scope: UNCHANGEDIntegrity: NONE
Confidentiality: LOWAvailability: NONE
Integrity: NONE 
Availability: NONE 
  
Reference:
https://lists.torproject.org/pipermail/tor-dev/2020-February/014146.html
https://lists.torproject.org/pipermail/tor-dev/2020-February/014147.html
https://security-tracker.debian.org/tracker/CVE-2020-8516
https://trac.torproject.org/projects/tor/ticket/33129
https://www.hackerfactor.com/blog/index.php?/archives/868-Deanonymizing-Tor-Circuits.html

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