What’s Vulnerable › Vulnerabilities

CVE-2015-1637

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 13.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2015-03-06 · updated 2026-06-17
• Weakness: CWE-310

Description

Schannel (aka Secure Channel) in Microsoft Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 does not properly restrict TLS state transitions, which makes it easier for remote attackers to conduct cipher-downgrade attacks to EXPORT_RSA ciphers via crafted TLS traffic, related to the "FREAK" issue, a different vulnerability than CVE-2015-0204 and CVE-2015-1067.

Affected products

• Microsoft Windows 7: all versions
• Microsoft Windows 8: all versions
• Microsoft Windows 8.1: all versions
• Microsoft Windows Rt: all versions
• Microsoft Windows RT 8.1: all versions
• Microsoft Windows Server 2003: all versions
• Microsoft Windows Server 2008: r2-sp1
• Microsoft Windows Server 2012: r2
• Microsoft Windows Vista: all versions

References

• http://web.archive.org/web/20150321220028/https://freakattack.com/
• http://www.securityfocus.com/bid/72965
• http://www.securitytracker.com/id/1031833
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-031
• https://freakattack.com/
• https://technet.microsoft.com/library/security/3046015
• http://web.archive.org/web/20150321220028/https://freakattack.com/
• http://www.securityfocus.com/bid/72965
• http://www.securitytracker.com/id/1031833
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-031
• https://freakattack.com/
• https://technet.microsoft.com/library/security/3046015

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