CVE-2009-1122

Severity: high (CVSS 7.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 98.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2009-06-10 · updated 2026-06-16
Weakness: CWE-287

Description

The WebDAV extension in Microsoft Internet Information Services (IIS) 5.0 on Windows 2000 SP4 does not properly decode URLs, which allows remote attackers to bypass authentication, and possibly read or create files, via a crafted HTTP request, aka "IIS 5.0 WebDAV Authentication Bypass Vulnerability," a different vulnerability than CVE-2009-1535.

Affected products

Microsoft IIS: 5.0

References

http://www.attrition.org/pipermail/vim/2009-June/002192.html
http://www.securityfocus.com/bid/35232
http://www.securitytracker.com/id?1022358
http://www.us-cert.gov/cas/techalerts/TA09-160A.html
http://www.vupen.com/english/advisories/2009/1539
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-020
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5861
http://www.attrition.org/pipermail/vim/2009-June/002192.html
http://www.securityfocus.com/bid/35232
http://www.securitytracker.com/id?1022358
http://www.us-cert.gov/cas/techalerts/TA09-160A.html
http://www.vupen.com/english/advisories/2009/1539

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