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Exploited vulnerability · CISA KEV

Is CVE-2013-3896 exploited? Yes: in CISA KEV since 25 May 2022

Gociux · Microsoft Silverlight · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2013-3896, Microsoft Silverlight Information Disclosure Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 25 May 2022, 3150 days after it was published. It affects Microsoft Silverlight. If you run it, CISA's required action is: The impacted product is end-of-life and should be disconnected if still in use.

exploitedYesCISA KEV · 25 May 2022
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity5.5CVSS 3.1 · medium
US federal due15 Jun 2022BOD 22-01 deadline

What it is

Microsoft Silverlight does not properly validate pointers during access to Silverlight elements, which allows remote attackers to obtain sensitive information via a crafted Silverlight application.

VendorMicrosoft (391 exploited CVEs in KEV)
ProductSilverlight
VulnerabilityMicrosoft Silverlight Information Disclosure Vulnerability
WeaknessCWE-20
Published9 Oct 2013
Added to KEV25 May 2022
Reported by (CNA)microsoft

What to do

  1. Check whether you run it. Look for Silverlight in your asset inventory, including appliances and cloud images. Stack check lists every exploited Microsoft CVE at once.
  2. Apply the fix. The impacted product is end-of-life and should be disconnected if still in use.
  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 9 Oct 2013.
  4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

Other exploited CVEs in Silverlight

References

Questions

Is CVE-2013-3896 being exploited?

Yes. CISA added CVE-2013-3896 to the Known Exploited Vulnerabilities catalog on 25 May 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2013-3896 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-2013-3896?

The impacted product is end-of-life and should be disconnected if still in use. Check Microsoft's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Silverlight 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 May 2022 · Microsoft scorecard · act-now radar.

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