{"cve":"CVE-2011-0091","nvd":{"published":"2011-02-10T16:00:13.723","modified":"2026-06-16T23:26:47.467","status":"Modified","description":"Kerberos in Microsoft Windows Server 2008 R2 and Windows 7 does not prevent a session from changing from strong encryption to DES encryption, which allows man-in-the-middle attackers to spoof network traffic and obtain sensitive information via a DES downgrade, aka \"Kerberos Spoofing Vulnerability.\"","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-287"],"references":["http://osvdb.org/70835","http://secunia.com/advisories/43257","http://support.avaya.com/css/P8/documents/100127250","http://www.securityfocus.com/bid/46140","http://www.securitytracker.com/id?1025048"],"products":["microsoft:windows_7","microsoft:windows_server_2008"],"source":"nvd","synced_at":"2026-10-19T19:57:56.749847046+00:00"},"epss":{"cve":"CVE-2011-0091","score":0.05486,"percentile":0.92772,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}