CVE-2016-8858

Severity CVSS v4.0:

Pending analysis

Type:

CWE-399 Resource Management Errors

Publication date:

09/12/2016

Last modified:

12/04/2025

Description

The kex_input_kexinit function in kex.c in OpenSSH 6.x and 7.x through 7.3 allows remote attackers to cause a denial of service (memory consumption) by sending many duplicate KEXINIT requests. NOTE: a third party reports that "OpenSSH upstream does not consider this as a security issue."

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:C CVSS v2.0 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C

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

Base Score 2.0

7.80

Severity 2.0

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:openbsd:openssh:6.8:::::::*
cpe:2.3:a:openbsd:openssh:6.9:::::::*
cpe:2.3:a:openbsd:openssh:7.0:::::::*
cpe:2.3:a:openbsd:openssh:7.1:::::::*
cpe:2.3:a:openbsd:openssh:7.2:::::::*
cpe:2.3:a:openbsd:openssh:7.3:::::::*

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

CPE	From	Up to
cpe:2.3:a:openbsd:openssh:6.8:::::::*
cpe:2.3:a:openbsd:openssh:6.9:::::::*
cpe:2.3:a:openbsd:openssh:7.0:::::::*
cpe:2.3:a:openbsd:openssh:7.1:::::::*
cpe:2.3:a:openbsd:openssh:7.2:::::::*
cpe:2.3:a:openbsd:openssh:7.3:::::::*

CVE-2016-8858

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools