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CVE-2016-0034

Published: Jan 13, 2016Updated: Aug 14, 2026 Sources: CVE List NVD BDUNVD-CWE-noinfo
8.8HIGH
NVD MITRE
EPSS Score
69.6%
Top 0.7%
CISA KEV
Active Exploitation
Since May 25, 2022
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

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."

In plain language

AI Act now

CVE-2016-0034 is a Silverlight 5 problem where visiting a malicious website can crash your computer or let an attacker run code—if you still use Silverlight 5, you should act now.

Executive summary

CVE-2016-0034 is a remote attack against Microsoft Silverlight via crafted web content that abuses negative offset handling during decoding, enabling remote code execution or denial of service; exploitation is confirmed by CISA KEV and Silverlight is end-of-life.

If affected, business impact
Full application compromiseWidespread malware/ransomware riskService disruption and downtimePossible data theft risk

What to do now

  1. Check whether any of your computers use Microsoft Silverlight 5 (especially if staff browse internal or external sites that may load Silverlight content).
  2. Verify installed Silverlight 5 version; consider the system impacted if it is older than 5.1.41212.0.
  3. Remove or disable Silverlight on business workstations that don’t require it, and block Silverlight content in browsers when possible.
  4. If Silverlight must remain for a specific application, upgrade to Silverlight 5 fixed version 5.1.41212.0 (per MS16-006 guidance) and then retest that the required sites/features still work.
  5. Disconnect any system that still has impacted Silverlight in place but cannot be updated or disabled, and prioritize replacing the end-of-life dependency with a modern alternative.
Patch / advisory Usually a quick update

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

NVD-CWE-noinfo

Affected Products

Microsoft Corp
commercial·USaka microsoft, microsoft corporation
SilverlightOn-premDesktop App
Operating Systems / windows
and 2 more affected products View all →

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:May 25, 2022
Remediation due:Jun 15, 2022
Ransomware:Known ransomware use

Required action: The impacted products are end-of-life and should be disconnected if still in use.

Official Patch Available
Is your org exposed to CVE-2016-0034?We can run the check for you — a free external exposure review, no install. Check my exposure

References

http://technet.microsoft.com/security/bulletin/MS16-006
technet.microsoft.com
http://www.securitytracker.com/id/1034655
securitytracker.com
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-006
docs.microsoft.com
and 1 more references View all →

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