Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2019-8955

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
21/02/2019
Last modified:
17/06/2026

Description

In Tor before 0.3.3.12, 0.3.4.x before 0.3.4.11, 0.3.5.x before 0.3.5.8, and 0.4.x before 0.4.0.2-alpha, remote denial of service against Tor clients and relays can occur via memory exhaustion in the KIST cell scheduler.

Impact

Vector 3.x
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
7.50
Severity 3.x
HIGH
Vector 2.0
AV:N/AC:L/Au:N/C:N/I:N/A:P CVSS v2.0 Severity and Metrics:

Base Score: 5.00 MEDIUM
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Physical

Base Score 2.0
5.00
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:* 0.3.3.12 (excluding)
cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:* 0.3.4.8 (including) 0.3.4.11 (excluding)
cpe:2.3:a:torproject:tor:0.3.4.0:alpha-dev:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.4.1:alpha:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.4.2:alpha:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.4.3:alpha:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.4.4:rc:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.4.5:rc:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.4.6:rc:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.4.7:rc:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.5.0:alpha-dev:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.5.1:alpha:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.5.2:alpha:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.5.3:alpha:*:*:*:*:*:*
cpe:2.3:a:torproject:tor:0.3.5.4:alpha:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools