{"id":"CVE-2009-1535","aliases":["EUVD-2009-1531","GHSA-f2c7-qmx6-wq66"],"status":"published","title":"The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote...","description":"The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote attackers to bypass URI-based protection mechanisms, and list folders or read, create, or modify files, via a %c0%af (Unicode / character) at an arbitrary position in the URI, as demonstrated by inserting %c0%af into a \"/protected/\" initial pathname component to bypass the password protection on the protected\\ folder, aka \"IIS 5.1 and 6.0 WebDAV Authentication Bypass Vulnerability,\" a different vulnerability than CVE-2009-1122.","severity":{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.98115,"percentile":0.99912,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-287"],"published":"2009-06-10T14:00:00Z","modified":"2026-06-16T23:07:28Z","exploits":[{"source":"exploitdb","id":"EDB-8704","title":"Microsoft IIS 6.0 - WebDAV Remote Authentication Bypass (1)","type":"remote","platform":"windows","date":"2009-05-15","verified":true,"url":"https://www.exploit-db.com/exploits/8704"},{"source":"exploitdb","id":"EDB-8806","title":"Microsoft IIS 6.0 - WebDAV Remote Authentication Bypass (2)","type":"remote","platform":"windows","date":"2009-05-26","verified":true,"url":"https://www.exploit-db.com/exploits/8806"},{"source":"metasploit","id":"auxiliary/scanner/http/dir_webdav_unicode_bypass","title":"MS09-020 IIS6 WebDAV Unicode Auth Bypass Directory Scanner","type":"auxiliary","verified":true,"url":"https://www.rapid7.com/db/modules/auxiliary/scanner/http/dir_webdav_unicode_bypass"},{"source":"metasploit","id":"auxiliary/scanner/http/ms09_020_webdav_unicode_bypass","title":"MS09-020 IIS6 WebDAV Unicode Authentication Bypass","type":"auxiliary","verified":true,"url":"https://www.rapid7.com/db/modules/auxiliary/scanner/http/ms09_020_webdav_unicode_bypass"}],"products":[{"vendor":"microsoft","product":"internet_information_services"}],"references":[{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6029","tags":["vdb-entry","signature","x_refsource_OVAL","x_transferred","Third Party Advisory"]},{"url":"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-020","tags":["vendor-advisory","x_refsource_MS","x_transferred","Patch","Vendor Advisory"]},{"url":"http://view.samurajdata.se/psview.php?id=023287d6\u0026page=1","tags":["x_refsource_MISC","x_transferred","Broken Link"]},{"url":"http://isc.sans.org/diary.html?n\u0026storyid=6397","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"http://archives.neohapsis.com/archives/fulldisclosure/2009-05/0135.html","tags":["mailing-list","x_refsource_FULLDISC","x_transferred","Broken Link"]},{"url":"http://archives.neohapsis.com/archives/fulldisclosure/2009-05/0139.html","tags":["mailing-list","x_refsource_FULLDISC","x_transferred","Broken Link"]},{"url":"http://blog.zoller.lu/2009/05/iis-6-webdac-auth-bypass-and-data.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"http://www.us-cert.gov/cas/techalerts/TA09-160A.html","tags":["third-party-advisory","x_refsource_CERT","x_transferred","Third Party Advisory","US Government Resource"]},{"url":"http://archives.neohapsis.com/archives/fulldisclosure/2009-05/att-0135/IIS_Advisory.pdf","tags":["x_refsource_MISC","x_transferred","Broken Link"]},{"url":"http://archives.neohapsis.com/archives/fulldisclosure/2009-05/0144.html","tags":["mailing-list","x_refsource_FULLDISC","x_transferred","Broken Link"]},{"url":"http://www.attrition.org/pipermail/vim/2009-June/002192.html","tags":["mailing-list","x_refsource_VIM","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2009-1535"},{"url":"https://github.com/advisories/GHSA-f2c7-qmx6-wq66"}],"sources":{"cve":[{"id":"CVE-2009-1535","description":"The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote attackers to bypass URI-based protection mechanisms, and list folders or read, create, or modify files, via a %c0%af (Unicode / character) at an arbitrary position in the URI, as demonstrated by inserting %c0%af into a \"/protected/\" initial pathname component to bypass the password protection on the protected\\ folder, aka \"IIS 5.1 and 6.0 WebDAV Authentication Bypass Vulnerability,\" a different vulnerability than CVE-2009-1122.","status":"published","published":"2009-06-10T14:00:00Z","modified":"2024-08-07T05:13:25.766Z","updated_at":"2026-11-02T14:33:25.516454Z"}],"euvd":[{"id":"EUVD-2009-1531","description":"The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote attackers to bypass URI-based protection mechanisms, and list folders or read, create, or modify files, via a %c0%af (Unicode / character) at an arbitrary position in the URI, as demonstrated by inserting %c0%af into a \"/protected/\" initial pathname component to bypass the password protection on the protected\\ folder, aka \"IIS 5.1 and 6.0 WebDAV Authentication Bypass Vulnerability,\" a different vulnerability than CVE-2009-1122.","status":"published","published":"2009-06-10T14:00:00Z","modified":"2024-08-07T05:13:25Z","updated_at":"2026-11-03T01:39:21.330306Z"}],"ghsa":[{"id":"GHSA-f2c7-qmx6-wq66","title":"The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote...","description":"The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote attackers to bypass URI-based protection mechanisms, and list folders or read, create, or modify files, via a %c0%af (Unicode / character) at an arbitrary position in the URI, as demonstrated by inserting %c0%af into a \"/protected/\" initial pathname component to bypass the password protection on the protected\\ folder, aka \"IIS 5.1 and 6.0 WebDAV Authentication Bypass Vulnerability,\" a different vulnerability than CVE-2009-1122.","status":"published","published":"2022-05-02T03:26:06Z","modified":"2023-01-31T05:07:57Z","cwes":["CWE-287"],"updated_at":"2026-11-02T14:49:18.423365Z"}],"nvd":[{"id":"CVE-2009-1535","description":"The WebDAV extension in Microsoft Internet Information Services (IIS) 5.1 and 6.0 allows remote attackers to bypass URI-based protection mechanisms, and list folders or read, create, or modify files, via a %c0%af (Unicode / character) at an arbitrary position in the URI, as demonstrated by inserting %c0%af into a \"/protected/\" initial pathname component to bypass the password protection on the protected\\ folder, aka \"IIS 5.1 and 6.0 WebDAV Authentication Bypass Vulnerability,\" a different vulnerability than CVE-2009-1122.","status":"published","published":"2009-06-10T14:30:00.17Z","modified":"2026-06-16T23:07:28.58Z","cvss":[{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:01:35.733785Z"}]}}