How severe is CVE-2012-6066?

CVE-2012-6066 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2012-6066 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 40% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-6066?

CVE-2012-6066 primarily affects Freesshd. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2012-6066?

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-2012-6066 published?

CVE-2012-6066 was published on 2012-12-04 and last updated on 2026-06-16.

CVE-2012-6066

CVE-2012-6066 is a critical-severity vulnerability in Freesshd with a CVSS 2.0 base score of 9.3. Its EPSS exploit-prediction score of 40% 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: 40% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Freesshd
Published: 2012-12-04
Last modified: 2026-06-16

Description

freeSSHd.exe in freeSSHd through 1.2.6 allows remote attackers to bypass authentication via a crafted session, as demonstrated by an OpenSSH client with modified versions of ssh.c and sshconnect2.c.

Frequently asked questions

What is CVE-2012-6066?: freeSSHd.exe in freeSSHd through 1.2.6 allows remote attackers to bypass authentication via a crafted session, as demonstrated by an OpenSSH client with modified versions of ssh.c and sshconnect2.c.
How severe is CVE-2012-6066?: CVE-2012-6066 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2012-6066 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 40% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-6066?: CVE-2012-6066 primarily affects Freesshd. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2012-6066?: 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-2012-6066 published?: CVE-2012-6066 was published on 2012-12-04 and last updated on 2026-06-16.

References

http://archives.neohapsis.com/archives/fulldisclosure/2012-12/0012.html

Affected products (3)

cpe:2.3:a:freesshd:freesshd:*:*:*:*:*:*:*:*
cpe:2.3:a:freesshd:freesshd:1.2.1:*:*:*:*:*:*:*
cpe:2.3:a:freesshd:freesshd:1.2.2:*:*:*:*:*:*:*

More vulnerabilities in Freesshd

CVE-2018-9853 — Critical (CVSS 9.8): Insecure access control in freeSSHd version 1.3.1 allows attackers to obtain the privileges of the freesshd.exe process…
CVE-2008-6899 — Critical (CVSS 9.0): Multiple buffer overflows in freeSSHd 1.2.1 allow remote authenticated users to cause a denial of service (crash) and…
CVE-2008-4762 — Critical (CVSS 9.0): Stack-based buffer overflow in freeSSHd 1.2.1 allows remote authenticated users to cause a denial of service (service…
CVE-2008-2573 — High (CVSS 8.5): Stack-based buffer overflow in SFTP in freeSSHd 1.2.1 allows remote authenticated users to execute arbitrary code via a…
CVE-2017-1000475 — High (CVSS 7.8): FreeSSHd 1.3.1 version is vulnerable to an Unquoted Path Service allowing local users to launch processes with elevated…
CVE-2006-2407 — High (CVSS 7.5): Stack-based buffer overflow in (1) WeOnlyDo wodSSHServer ActiveX Component 1.2.7 and 1.3.3 DEMO, as used in other…

All CVEs affecting Freesshd →

Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-45480 — Critical (CVSS 10.0): Improper authentication in Azure Active Directory allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-46389 — Critical (CVSS 10.0): UDS Identity Config builds the Keycloak configuration image (realm, plugins, theme, truststore, JARs) consumed by UDS…
CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
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…

Browse all CWE-287 (Improper Authentication) vulnerabilities →