Vulnerability record · CVE-1999-1231 · published 9 June 1999

CVE-1999-1231: Ssh2 vulnerability

Ssh · Ssh2

ssh 2.0.12, and possibly other versions, allows valid user names to attempt to enter the correct password multiple times, but only prompts an invalid user name for a password once, which allows remote attackers to determine user account names on the server.

5.0 CVSS 2.0 Medium EPSS 1.5% · top 27.4%

5.0CVSS 2.0 base score

1.5%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

4References, 2 tagged exploit

16 Jun 2026Last modified by NVD

Description

AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Ssh2 Ssh

References

Link	Tags
http://www.securityfocus.com/archive/1/14758	ExploitPatchVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/2276
http://www.securityfocus.com/archive/1/14758	ExploitPatchVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/2276

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2002-1645Ssh2 vulnerabilityBuffer overflow in the URL catcher feature for SSH Secure Shell for Workstations client 3.1 to 3.2.0 allows remote attackers to execute arbitrary cod…EPSS 7.9%25 Nov 2002 7.5CVE-1999-1029Ssh2 vulnerabilitySSH server (sshd2) before 2.0.12 does not properly record login attempts if the connection is closed before the maximum number of tries, allowing a r…EPSS 1.6%13 May 1999 7.2CVE-2002-1715Ssh vulnerabilitySSH 1 through 3, and possibly other versions, allows local users to bypass restricted shells such as rbash or rksh by uploading a script to a world-w…EPSS 0.89%31 Dec 2002 7.2CVE-2002-1644Ssh2 vulnerabilitySSH Secure Shell for Servers and SSH Secure Shell for Workstations 2.0.13 through 3.2.1, when running without a PTY, does not call setsid to remove t…EPSS 0.45%25 Nov 2002 5.1CVE-2000-0217Openbsd openssh vulnerabilityThe default configuration of SSH allows X forwarding, which could allow a remote attacker to control a client's X sessions via a malicious xauth prog…EPSS 0.97%24 Feb 2000 5.0CVE-2001-0364Ssh2 vulnerabilitySSH Communications Security sshd 2.4 for Windows allows remote attackers to create a denial of service via a large number of simultaneous connections.EPSS 1.6%27 Jun 2001 4.6CVE-1999-0398Ssh vulnerabilityIn some instances of SSH 1.2.27 and 2.0.11 on Linux systems, SSH will allow users with expired accounts to login.EPSS 0.39%1 Jan 1999 4.6CVE-1999-1159Ssh2 vulnerabilitySSH 2.0.11 and earlier allows local users to request remote forwarding from privileged ports without being root.EPSS 0.34%29 Dec 1998

Source: NIST National Vulnerability Database (record CVE-1999-1231), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.