How severe is CVE-2012-5975?

CVE-2012-5975 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2012-5975 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 36% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-5975?

CVE-2012-5975 primarily affects Ssh Tectia Server. In total, 35 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2012-5975?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2012-5975 published?

CVE-2012-5975 was published on 2012-12-04 and last updated on 2026-06-16.

CVE-2012-5975

CVE-2012-5975 is a critical-severity vulnerability in Ssh Tectia Server with a CVSS 2.0 base score of 9.3. Its EPSS exploit-prediction score of 36% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-287.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 36% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Ssh Tectia Server
Published: 2012-12-04
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2012-5975?: 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.
How severe is CVE-2012-5975?: CVE-2012-5975 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2012-5975 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 36% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-5975?: CVE-2012-5975 primarily affects Ssh Tectia Server. In total, 35 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2012-5975?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2012-5975 published?: CVE-2012-5975 was published on 2012-12-04 and last updated on 2026-06-16.

References

Affected products (35)

cpe:2.3:a:ssh:tectia_server:6.0.4:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.0.5:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.0.6:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.0.7:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.0.8:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.0.9:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.0.10:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.0.11:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.0.12:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.0.13:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.0.14:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.0.17:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.0.18:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.0.19:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.0.20.:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.1.0:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.1.1:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.1.2:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.1.3:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.1.4:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.1.5:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.1.6:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.1.7:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.1.8:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.1.9:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.1.12:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.2.0:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.2.1:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.2.2:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.2.3:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.2.4:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.2.5:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.3.0:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.3.1:*:*:*:*:*:*:*
cpe:2.3:a:ssh:tectia_server:6.3.2:*:*:*:*:*:*:*

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Other CWE-287 (Improper Authentication) vulnerabilities

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CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

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