CVE-2017-8822

Publication date 3 December 2017

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

In Tor before 0.2.5.16, 0.2.6 through 0.2.8 before 0.2.8.17, 0.2.9 before 0.2.9.14, 0.3.0 before 0.3.0.13, and 0.3.1 before 0.3.1.9, relays (that have incompletely downloaded descriptors) can pick themselves in a circuit path, leading to a degradation of anonymity, aka TROVE-2017-012.

From the Ubuntu Security Team

It was discovered that Tor could make itself part of a circuit path resulting in degraded anonymity.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
tor	18.10 cosmic	Not affected
	18.04 LTS bionic	Not affected
	17.10 artful	Fixed 0.3.0.13-0ubuntu1~17.10.2
	17.04 zesty	Ignored end of life
	16.04 LTS xenial	Fixed 0.2.9.14-1ubuntu1~16.04.2
	14.04 LTS trusty	Fixed 0.2.4.27-1ubuntu0.1

Severity score breakdown

CVSS version: CVSS v3.0

Base score 3.7 · Low

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	Low
Integrity impact	None
Availability impact	None

Scores

Parameter	Value
Base score	3.7 · Low
Exploitability score	-
Impact score	-

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N