What’s Vulnerable › Vulnerabilities

CVE-2011-0091

• Severity: medium (CVSS 6.4 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2011-02-10 · updated 2026-06-16
• Weakness: CWE-287

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."

Affected products

• Microsoft Windows 7: all versions
• Microsoft Windows Server 2008: r2

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
• http://www.vupen.com/english/advisories/2011/0326
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-013
• https://exchange.xforce.ibmcloud.com/vulnerabilities/64901
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12498
• http://osvdb.org/70835
• http://secunia.com/advisories/43257
• http://support.avaya.com/css/P8/documents/100127250

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