# CVE-2016-0034: Microsoft Silverlight Runtime Remote Code Execution

> Remote attackers can execute arbitrary code or cause denial of service via crafted websites due to improper handling of negative offsets in Silverlight.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Yes, since 25 May 2022 (CISA KEV), used in ransomware
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 13 Jan 2016
- **Updated:** 14 Aug 2026
- **Also known as:** GHSA-8wh9-64cq-2gj5

## What is CVE-2016-0034?

CVE-2016-0034 is a high-severity memory corruption vulnerability in n/a, published on 13 Jan 2016. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official 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."

## Which versions are affected by CVE-2016-0034?

It affects 1 product.


Products: Microsoft Silverlight.

## How do I fix CVE-2016-0034?

No fix has been published for CVE-2016-0034 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 15 Jun 2022.

## Is CVE-2016-0034 being exploited?

Yes. Attackers have exploited CVE-2016-0034 in the wild since at least 25 May 2022, including in ransomware campaigns.

## Other vulnerabilities in n/a

- [CVE-2013-0074](https://insights.sbomify.com/CVE-2013-0074/): Microsoft Silverlight Double Dereference (high 7.8, exploited in the wild)
- [CVE-2013-3896](https://insights.sbomify.com/CVE-2013-3896/): Microsoft Silverlight Information Disclosure (medium 5.5, exploited in the wild)
- [CVE-2015-6166](https://insights.sbomify.com/CVE-2015-6166/): Memory corruption in n/a (critical 9.3)
- [CVE-2015-1715](https://insights.sbomify.com/CVE-2015-1715/): Security feature bypass in n/a (critical 9.3)
- [CVE-2013-3178](https://insights.sbomify.com/CVE-2013-3178/): Null dereference in n/a (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-0034 and fix it if it is affected.

What it is: CVE-2016-0034 is a high-severity memory corruption vulnerability in n/a, published on 13 Jan 2016. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: Yes. Attackers have exploited CVE-2016-0034 in the wild since at least 25 May 2022, including in ransomware campaigns.

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2016-0034/ (Markdown: https://insights.sbomify.com/CVE-2016-0034/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-0034
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-0034
- OSV: https://osv.dev/vulnerability/CVE-2016-0034

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From sbomify Insights: https://insights.sbomify.com/CVE-2016-0034/
Summaries are generated and may contain mistakes; the official description above is the record.