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CVE-2009-0550

• Severity: critical (CVSS 9.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 11.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2009-04-15 · updated 2026-06-16

Description

Windows HTTP Services (aka WinHTTP) in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP1 and SP2, Vista Gold and SP1, and Server 2008; and WinINet in Microsoft Internet Explorer 5.01 SP4, 6 SP1, 6 and 7 on Windows XP SP2 and SP3, 6 and 7 on Windows Server 2003 SP1 and SP2, 7 on Windows Vista Gold and SP1, and 7 on Windows Server 2008; allows remote web servers to capture and replay NTLM credentials, and execute arbitrary code, via vectors related to absence of a "credential-reflection protections" opt-in step, aka "Windows HTTP Services Credential Reflection Vulnerability" and "WinINet Credential Reflection Vulnerability."

Affected products

• Microsoft Ie: 6.0-sp1
• Microsoft Internet Explorer 11: 5.01-sp4, 6, 7
• Microsoft Windows 2000: all versions
• Microsoft Windows Server 2003: all versions
• Microsoft Windows Server 2008: all versions
• Microsoft Windows Vista: gold
• Microsoft Windows XP Service Pack 3: all versions

References

• http://blogs.technet.com/srd/archive/2009/04/14/ntlm-credential-reflection-updates-for-http-clients.aspx
• http://osvdb.org/53619
• http://secunia.com/advisories/34677
• http://secunia.com/advisories/34678
• http://support.avaya.com/elmodocs2/security/ASA-2009-133.htm
• http://support.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=871138
• http://www.securityfocus.com/bid/34439
• http://www.securitytracker.com/id?1022041
• http://www.us-cert.gov/cas/techalerts/TA09-104A.html
• http://www.vupen.com/english/advisories/2009/1027
• http://www.vupen.com/english/advisories/2009/1028
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-013

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