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ExploitedIn CISA KEVFix available

CVE-2016-0034

Exploitation confirmed. First attested on 2022-05-25 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2016-01-13
  • Fixed in5.1.41212.0

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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."

Timeline

dates in UTC
  1. 2016-01-1305:59CVE publishedNVD
  2. 2022-05-25Added to the CISA KEV catalogCISA KEV
  3. 2022-05-25Listed as exploited by GCVEGCVE
  4. 2022-05-25Exploitation first reportedCISA KEV
  5. 2025-02-1016:59SSVC exploitation set to activeCISA-ADP
  6. 2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2016-0034?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-0034?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Microsoft silverlight
BranchAffectedFixed in
5.x≥ 5.0, < 5.1.41212.05.1.41212.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Microsoft silverlight to 5.1.41212.0
  2. CISA’s required action: The impacted products are end-of-life and should be disconnected if still in use.due 2022-06-15

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

CISA Known Exploited Vulnerability

Date Added
2022-05-25
Patch Due Date
2022-06-15
Ransomware Use
Known
Required Action
The impacted products are end-of-life and should be disconnected if still in use.

Sources

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2016-01-13
Last Modified
2026-08-14
NVD status
Analyzed

Frequently asked questions

What is CVE-2016-0034?

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."

Is CVE-2016-0034 actively exploited?

Yes. CVE-2016-0034 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-06-15.

What is the CVSS score for CVE-2016-0034?

CVE-2016-0034 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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