CVE-2011-2005

CVE-2011-2005 is a high-severity (CVSS 7.8) vulnerability in Microsoft Ancillary Function Driver (afd.sys). CISA added it to the Known Exploited Vulnerabilities catalog on March 28, 2022, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by April 18, 2022. CISA does not currently list it as used in ransomware campaigns. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.

afd.sys in the Ancillary Function Driver in Microsoft Windows XP SP2 and SP3 and Server 2003 SP2 does not properly validate user-mode input passed to kernel mode, which allows local users to gain privileges via a crafted application, aka "Ancillary Function Driver Elevation of Privilege Vulnerability."

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-080
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13114
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-080
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13114
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2011-2005