The Ancillary Function Driver (AFD) in afd.sys in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Win…

published 2011-06-16 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-1257

cvss: 7.2; version 2.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 8.4%; EPSS 8.4% chance of exploitation in 30 days, percentile 95%
public exploits: 2; Exploit-DB

The Ancillary Function Driver (AFD) in afd.sys in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 does not properly validate user-mode input, which allows local users to gain privileges via a crafted application, aka "Ancillary Function Driver Elevation of Privilege Vulnerability."

Timeline

2011-06-16 Published
2012-04-19 First public exploit (EDB-18755)

Exploit prediction

8.42% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

EDB-40564 Microsoft Windows (x86) - 'afd.sys' Local Privilege Escalation (MS11-046) local, 2016-10-18
EDB-18755 Microsoft Windows - 'afd.sys' Local Kernel (PoC) (MS11-046) dos, 2012-04-19

CVSS scores

assigned by	version	score	vector
NVD	2.0	7.2	AV:L/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness

CWE-264 Permissions, Privileges, and Access Controls

References

exploit-db.com /exploits/40564/
exploit
docs.microsoft.com /en-us/security-updates/securitybulletins/2011/ms11-046
vendor-advisory
oval.cisecurity.org /repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12731
vdb-entry, signature

Sources

CVE List CVE-2011-1249
NVD CVE-2011-1249

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary