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Vulnerability record · CVE-2012-5975 · published 4 December 2012

CVE-2012-5975: Ssh tectia server improper authentication vulnerability

Ssh · Tectia Server

The SSH USERAUTH CHANGE REQUEST feature in SSH Tectia Server 6.0.4 through 6.0.20, 6.1.0 through 6.1.12, 6.2.0 through 6.2.5, and 6.3.0 through 6.3.2 on UNIX and Linux, when old-style password authentication is enabled, allows remote attackers to bypass authentication via a crafted session involving entry of blank passwords, as demonstrated by a root login session from a modified OpenSSH client with an added input_userauth_passwd_changereq call in sshconnect2.c.

9.3 CVSS 2.0 High EPSS 36% · top 1.6% CWE-287 · Improper authentication
9.3CVSS 2.0 base score
36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

The SSH USERAUTH CHANGE REQUEST feature in SSH Tectia Server 6.0.4 through 6.0.20, 6.1.0 through 6.1.12, 6.2.0 through 6.2.5, and 6.3.0 through 6.3.2 on UNIX and Linux, when old-style password authentication is enabled, allows remote attackers to bypass authentication via a crafted session involving entry of blank passwords, as demonstrated by a root login session from a modified OpenSSH client with an added input_userauth_passwd_changereq call in sshconnect2.c.

AV:N/AC:M/Au:N/C:C/I:C/A:C

Affected products

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

References

LinkTags
http://archives.neohapsis.com/archives/fulldisclosure/2012-12/0013.html
http://archives.neohapsis.com/archives/fulldisclosure/2012-12/0065.html
http://www.exploit-db.com/exploits/23082/
https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/unix/ssh/tectia_passwd_changereq.rb Exploit
http://archives.neohapsis.com/archives/fulldisclosure/2012-12/0013.html
http://archives.neohapsis.com/archives/fulldisclosure/2012-12/0065.html
http://www.exploit-db.com/exploits/23082/
https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/unix/ssh/tectia_passwd_changereq.rb Exploit

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Related vulnerabilities

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

8.8CVE-2021-27891Ssh tectia client vulnerabilitySSH Tectia Client and Server before 6.4.19 on Windows have weak key generation. ConnectSecure on Windows is affected.EPSS 1.0%7.8CVE-2021-27892Ssh tectia client vulnerabilitySSH Tectia Client and Server before 6.4.19 on Windows allow local privilege escalation. ConnectSecure on Windows is affected.EPSS 0.25%7.5CVE-2005-4310Ssh tectia server vulnerabilitySSH Tectia Server 5.0.0 (A, F, and T), when allowing host-based authentication only, allows users to log in with the wrong credentials.EPSS 1.4%7.2CVE-2007-5616Ssh tectia client vulnerabilityssh-signer in SSH Tectia Client and Server 5.x before 5.2.4, and 5.3.x before 5.3.6, on Unix and Linux allows local users to gain privileges via unsp…EPSS 0.94%7.2CVE-2006-4315Ssh tectia client vulnerabilityUnquoted Windows search path vulnerability in multiple SSH Tectia products, including Client/Server/Connector 5.0.0 and 5.0.1 and Client/Server befor…EPSS 0.34%7.0CVE-2021-27893Ssh tectia client vulnerabilitySSH Tectia Client and Server before 6.4.19 on Windows allow local privilege escalation in nonstandard conditions. ConnectSecure on Windows is affecte…EPSS 0.38%5.0CVE-2006-5484Ssh tectia client vulnerabilitySSH Tectia Client/Server/Connector 5.1.0 and earlier, Manager 2.2.0 and earlier, and other products, when using an RSA key with exponent 3, removes P…EPSS 1.4%4.6CVE-2005-2146Ssh tectia server vulnerabilitySSH Tectia Server 4.3.1 and earlier, and SSH Secure Shell for Windows Servers, uses insecure permissions when generating the Secure Shell host identi…EPSS 0.31%

Source: NIST National Vulnerability Database (record CVE-2012-5975), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.