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Exploited vulnerability · CISA KEV

Is CVE-2011-2005 exploited? Yes: in CISA KEV since 28 Mar 2022

Gociux · Microsoft Ancillary Function Driver (afd.sys) · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2011-2005, Microsoft Ancillary Function Driver (afd.sys) Improper Input Validation Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 28 Mar 2022, 3820 days after it was published. It affects Microsoft Ancillary Function Driver (afd.sys). If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 28 Mar 2022
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity7.8CVSS 3.1 · high
US federal due18 Apr 2022BOD 22-01 deadline

What it is

afd.sys in the Ancillary Function Driver in Microsoft Windows does not properly validate user-mode input passed to kernel mode, which allows local users to gain privileges via a crafted application.

VendorMicrosoft (391 exploited CVEs in KEV)
ProductAncillary Function Driver (afd.sys)
VulnerabilityMicrosoft Ancillary Function Driver (afd.sys) Improper Input Validation Vulnerability
WeaknessCWE-264
Published12 Oct 2011
Added to KEV28 Mar 2022
Reported by (CNA)microsoft

What to do

  1. Check whether you run it. Look for Ancillary Function Driver (afd.sys) in your asset inventory, including appliances and cloud images. Stack check lists every exploited Microsoft CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 12 Oct 2011.
  4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

References

Questions

Is CVE-2011-2005 being exploited?

Yes. CISA added CVE-2011-2005 to the Known Exploited Vulnerabilities catalog on 28 Mar 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2011-2005 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2011-2005?

Apply updates per vendor instructions. Check Microsoft's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Ancillary Function Driver (afd.sys) and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in March 2022 · Microsoft scorecard · act-now radar.

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