PatchSiren

PatchSiren cyber security CVE debrief

CVE-2013-3896 Microsoft CVE debrief

CVE-2013-3896 is a Microsoft Silverlight information disclosure vulnerability that CISA added to the Known Exploited Vulnerabilities catalog on 2022-05-25. CISA’s entry identifies the impacted product as end-of-life and says it should be disconnected if still in use. For organizations that still have Silverlight present, this is a high-priority legacy-technology exposure because it is publicly tracked as known-exploited and has an explicit remediation deadline in the KEV catalog (2022-06-15).

Vendor
Microsoft
Product
Silverlight
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2022-05-25
Original CVE updated
2022-05-25
Advisory published
2022-05-25
Advisory updated
2022-05-25

Who should care

Security teams, endpoint and application owners, and legacy platform administrators should care if any systems still rely on Microsoft Silverlight. This is especially important for environments with older internal web apps, kiosk systems, or unmaintained endpoints that may still have the plugin installed.

Technical summary

The available official source corpus identifies the issue as an information disclosure vulnerability in Microsoft Silverlight. CISA lists it as known exploited and notes that the impacted product is end-of-life. The official materials provided here do not include deeper technical mechanics, so the safest conclusion is that exposure is tied to continued Silverlight use on affected systems rather than to any specific exploit method.

Defensive priority

High. Because CISA has placed this CVE in the KEV catalog and the product is described as end-of-life, the recommended defensive posture is immediate inventory, removal, or disconnection of any remaining Silverlight usage.

Recommended defensive actions

  • Inventory systems, browsers, and applications for any remaining Microsoft Silverlight dependency or installation.
  • Remove or disable Silverlight where possible, since the impacted product is described in the KEV entry as end-of-life.
  • If Silverlight cannot be removed immediately, disconnect or isolate the affected system as CISA recommends for still-in-use end-of-life products.
  • Prioritize remediation before the KEV due date of 2022-06-15 for any exposed assets.
  • Validate that business-critical applications have a replacement path that does not depend on Silverlight.

Evidence notes

CISA’s Known Exploited Vulnerabilities JSON lists CVE-2013-3896 as "Microsoft Silverlight Information Disclosure Vulnerability," with vendorProject Microsoft, product Silverlight, dateAdded 2022-05-25, and dueDate 2022-06-15. The entry’s note states: "The impacted product is end-of-life and should be disconnected if still in use." The provided official CVE and NVD links confirm the identifier and record context, but the supplied corpus does not include additional technical detail or CVSS data.

Official resources

This debrief is based only on the supplied official source corpus: the CISA KEV JSON entry and the linked official CVE/NVD references. No exploit details, weaponized reproduction steps, or unsupported claims are included.