High 8.8Known exploited (CISA KEV)Published Jan 13, 2016

CVE-2016-0034Microsoft Silverlight 5 before 5.1.41212.0 mishandles negative offsets during decoding, which allows remote attackers to execute arbitrary code or cause a denial of service (object-header corruption)…

Updated under an hour ago (2026-10-19 06:10 UTC)

Does this affect you?

It affects microsoft silverlight. Add what you run to find out whether that includes you.

CISA lists it as known exploited since May 25, 2022; federal agencies had to remediate by Jun 15, 2022, and it is known to be used in ransomware. Treat that date as your deadline.

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Every CVE for microsoft silverlight

Exploited in the last 30 days

Microsoft Silverlight 5 before 5.1.41212.0 mishandles negative offsets during decoding, which allows remote attackers to execute arbitrary code or cause a denial of service (object-header corruption) via a crafted web site, aka "Silverlight Runtime Remote Code Execution Vulnerability."

CVSS: 8.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Added to CISA KEV May 25, 2022; federal remediation due Jun 15, 2022; known ransomware useThe impacted products are end-of-life and should be disconnected if still in use.
EPSS (exploitation in the next 30 days): 69.40% (percentile 99)
Assigned by: microsoft
NVD analysis: Analyzed
Record last updated: Aug 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

microsoft silverlight microsoft:silverlight	from 5.0 before 5.1.41212.0	NVD

References

http://www.securitytracker.com/id/1034655vdb-entry, x-refsource-sectrack, broken-link, third-party-advisory
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-006vendor-advisory, x-refsource-ms, patch
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-0034us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.