Which products and versions are affected by CVE-2016-0034?

Affected: Silverlight (Microsoft). The full list is in the CVE brief.

Is CVE-2016-0034 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 25, 2015 and is known to be used in ransomware campaigns.

Is CVE-2016-0034 in the CISA KEV catalog?

Yes. It was added on May 25, 2022 with a federal remediation due date of Jun 15, 2022.

Is there a public exploit for CVE-2016-0034?

Public exploit code is available.

Is there a fix for CVE-2016-0034?

Fixed versions are available, including Silverlight 5.1.41212.0.

How urgently should CVE-2016-0034 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Request A Demo

Vulnerability Intelligence

CVE-2016-0034

HighExploitedPublic exploit

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…

Published Jan 13, 2016 · Updated Aug 14, 2026

Key Facts

Patch immediately

CVE-2016-0034 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Silverlight (Microsoft).
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 25, 2015 and is known to be used in ransomware campaigns. Public exploit code is available.
EPSS estimates a 69% probability of exploitation in the next 30 days.
Fixed versions are available, including Silverlight 5.1.41212.0.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

8.8

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS (30-day exploit likelihood)

69%

Higher than 99.3% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings, used by ransomware

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2016-0034 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	May 25, 2022	Jun 15, 2022	Known
Industry KEV feed	Nov 25, 2015	Jun 15, 2022	Known
CIRCL KEV	May 25, 2022	Jun 15, 2022	Known
ENISA EUVD	May 25, 2022	n/a	Not reported

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

Affected Products

1 affected entries in total

Product	Affected versions	Fixed in
SilverlightMicrosoft	See advisory	5.1.41212.0

Patched Releases

Silverlight

5.1.41212.0

Timeline

Added to Industry KEV feed
Nov 25, 2015
Publicly disclosed
Jan 13, 2016
Added to CISA KEV
May 25, 2022
Added to CIRCL KEV
May 25, 2022
Added to ENISA EUVD
May 25, 2022
Last updated
Aug 14, 2026

References

4 more references in the full CVE brief

FAQ

Common Questions.

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."
Affected: Silverlight (Microsoft). The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 25, 2015 and is known to be used in ransomware campaigns.
Yes. It was added on May 25, 2022 with a federal remediation due date of Jun 15, 2022.
Public exploit code is available.
Fixed versions are available, including Silverlight 5.1.41212.0.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2016-0034 Running On Your Attack Surface?

Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.