OpenSSH < 3.7 buffer_append_space Function Overflow

Critical Nessus Network Monitor Plugin ID 1994


The remote host is vulnerable to an flaw that allows attackers to execute arbitrary commands.


The remote host is running a version of OpenSSH that is vulnerable to a flaw in the buffer handling functions which may possibly leading to command execution.

Note: PVS has solely relied on the banner of the SSH client to perform this check. Any backported patches or workarounds such as recompiling or edited configurations are not observable through the banner.


Upgrade to OpenSSH 3.7 or higher.

Plugin Details

Severity: Critical

ID: 1994

Family: SSH

Published: 2004/08/20

Modified: 2016/11/23

Dependencies: 1997, 3059

Risk Information

Risk Factor: Critical


Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: CVSS2#E:U/RL:OF/RC:C


Base Score: 9.8

Temporal Score: 8.5


Temporal Vector: CVSS3#E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:openbsd:openssh

Reference Information

CVE: CVE-2003-0693, CVE-2003-0695

BID: 8628