How severe is CVE-2016-0034?

CVE-2016-0034 has a CVSS score of 8.8/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2016-0034?

Affected package information for CVE-2016-0034 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2016-0034?

No fixed version has been published for CVE-2016-0034 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

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

Yes. There are 2 known exploit references for CVE-2016-0034, including 2 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

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

CVE-2016-0034 has an EPSS (Exploit Prediction Scoring System) score of 54.9%, placing it in the 98th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2016-0034 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2016-0034 (Microsoft Silverlight Runtime Remote Code Execution Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2022-05-25. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-06-15. The required action was: The impacted products are end-of-life and should be disconnected if still in use. This CVE has been used in known ransomware campaigns. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

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

CVE-2016-0034 affects microsoft silverlight. Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2016-0034 published, and has it been updated?

CVE-2016-0034 was published on January 13, 2016 and was last updated on April 22, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2022-05-25 — agencies required to remediate by 2022-06-15 · Ransomware

CVE-2016-0034

HIGH

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…

Published

Jan 13, 2016

Updated

Apr 22, 2026

Affected

0 pkgs

Patched

None yet

Exploits

2 known

EPSS Exploitation Probability

via FIRST.org ↗

54.9%probability of exploitation in next 30 days

High Risk98th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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."

Affected Products

1 product · 1 configurations

Application

silverlightmicrosoft

≥ 5.0 && < 5.1.41212.0

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Microsoft Silverlight 5 before 5.1.41212.0 mishandles negative offsets d…

docs.microsoft.comGoogle-sheetNov 2015

Microsoft Silverlight 5 before 5.1.41212.0 mishandles negative offsets d…

cisa.govCISAMay 2022

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2016-0034 in your stack?

O3 detects CVE-2016-0034 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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