CVE-2020-8516

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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

** EN DISPUTA ** El demonio en Tor hasta la versión 0.4.1.8 y versiones 0.4.2.x hasta la versión 0.4.2.6, no comprueba que un nodo rendezvous sea conocido antes de intentar conectarse a él, lo que podría facilitar a atacantes remotos descubrir información del circuito. NOTA: El equipo de red de Tor afirma que este es un comportamiento previsto y no una vulnerabilidad.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-02-02 CVE Reserved
2020-02-02 CVE Published
2024-08-04 CVE Updated
2024-08-04 First Exploit
2025-01-26 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CAPEC

References (5)

URL	Tag	Source
https://security-tracker.debian.org/tracker/CVE-2020-8516	Third Party Advisory

URL	Date	SRC
https://www.hackerfactor.com/blog/index.php?/archives/868-Deanonymizing-Tor-Circuits.html	2024-08-04

URL	Date	SRC

URL	Date	SRC
https://lists.torproject.org/pipermail/tor-dev/2020-February/014146.html	2024-05-17
https://lists.torproject.org/pipermail/tor-dev/2020-February/014147.html	2024-05-17
https://trac.torproject.org/projects/tor/ticket/33129	2024-05-17

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Torproject Search vendor "Torproject"		Tor Search vendor "Torproject" for product "Tor"				<= 0.4.1.8 Search vendor "Torproject" for product "Tor" and version " <= 0.4.1.8"		-		Affected
Torproject Search vendor "Torproject"		Tor Search vendor "Torproject" for product "Tor"				>= 0.4.2.0 <= 0.4.2.6 Search vendor "Torproject" for product "Tor" and version " >= 0.4.2.0 <= 0.4.2.6"		-		Affected