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CVE-2009-0550

29
FAUCET Score

CVE-2009-0550 is a critical vulnerability affecting Windows HTTP Services (WinHTTP) and WinINet in various Microsoft Windows and Internet Explorer versions. It allows remote web servers to capture and replay NTLM credentials, potentially leading to arbitrary code execution due to a lack of "credential-reflection protections." With a CVSS score of 9.3 (Critical), this vulnerability has a network attack vector, medium attack complexity, and high impact on confidentiality, integrity, and availability. Despite its severity and high FAUCET Risk Score of 97/100, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_2000:*:sp4:*:*:*:*:*:*
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_server_2003:*:*:*:*:*:*:*:*
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_server_2003:*:sp1:*:*:*:*:*:*
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_server_2003:*:sp1:itanium:*:*:*:*:*
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_server_2003:*:sp2:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

9.3HIGH

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

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
11.84%
Probability of exploitation in next 30 days
EPSS Percentile
95.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.1184 is in the 77th percentile among its peer group of 8,918 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

blogs.technet.com / srd/archive/2009/04/14/ntlm-credential-reflection-updates-for-http-clients.aspx
osvdb.org / 53619
docs.microsoft.com / en-us/security-updates/securitybulletins/2009/ms09-013
docs.microsoft.com / en-us/security-updates/securitybulletins/2009/ms09-014
secunia.com / advisories/34677
secunia.com / advisories/34678
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5320
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6233
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7569
support.avaya.com / elmodocs2/security/ASA-2009-133.htm
support.nortel.com / go/main.jsp
securityfocus.com / bid/34439
securitytracker.com / id
us-cert.gov / cas/techalerts/TA09-104A.html
US Government Resource
vupen.com / english/advisories/2009/1027
vupen.com / english/advisories/2009/1028