CVE-2011-2005KEV · OVERDUE

Microsoft Ancillary Function Driver (afd.sys) Improper Input Validation Vulnerability

High · published October 12, 2011

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 7.8. It is confirmed in active exploitation. It sits in the 98.3th percentile for exploit probability.

1648
days past CISA
deadline
CVSS v3.1
7.8
EPSS
32%
Percentile
98.3
In the wild
Confirmed
What it is

🚀 A crafty application can elevate privileges just by sneaking some dodgy input into your Windows XP or Server 2003! ⚡ Think of it as a restaurant where a customer can switch their order after it's been submitted, allowing them to get a five-course meal for the price of a snack — just by manipulating the waiter with some tricky language. This vulnerability could let a local user go from a basic diner to the head chef, gaining access to sensitive system functions. An attacker could install malicious software, change security settings, or even take full control of the machine — absolutely devastating!

Put simply

Think of it as a restaurant where a customer can switch their order after it's been submitted, allowing them to get a five-course meal for the price of a snack — just by manipulating the waiter with some tricky language. The flaw in afd.sys allows improper validation of user-mode input passed to kernel mode, enabling attackers to execute code at a higher privilege level than intended through crafted applications.

What to do

This vulnerability could let a local user go from a basic diner to the head chef, gaining access to sensitive system functions. An attacker could install malicious software, change security settings, or even take full control of the machine — absolutely devastating! To safeguard your systems, ensure you are running Windows XP SP3 or Server 2003 SP2 with all the latest patches. Consider upgrading to a supported version of Windows where this vulnerability is mitigated. Don't forget to monitor local user activities closely! You've got this! Stay vigilant and patch up those systems to keep your digital kingdom safe! 🛡️

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.31761 · 98.3th percentile
Published
2011-10-12T01:00Z
KEV added
2022-03-28 · due 2022-04-18
EPSS history
Timeline
  • 28 MAR 00:00Z
    Added to CISA KEV — remediate by Apr 18
    kev
  • 12 OCT 01:00Z
    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…
    cvelistv5