# CVE-2014-1776: Microsoft Internet Explorer Memory Corruption

> Remote attackers can execute arbitrary code or cause denial of service in Internet Explorer via a use-after-free vulnerability in the CMarkup::IsConnectedToPrimaryMarkup function.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Yes, since 28 Jan 2022 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Apr 2014
- **Updated:** 22 Oct 2025
- **Also known as:** GHSA-44fv-7jv8-5cpp

## What is CVE-2014-1776?

CVE-2014-1776 is a critical use after free vulnerability in Microsoft Internet Explorer, published on 27 Apr 2014. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Use-after-free vulnerability in Microsoft Internet Explorer 6 through 11 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via vectors related to the CMarkup::IsConnectedToPrimaryMarkup function, as exploited in the wild in April 2014.  NOTE: this issue originally emphasized VGX.DLL, but Microsoft clarified that "VGX.DLL does not contain the vulnerable code leveraged in this exploit. Disabling VGX.DLL is an exploit-specific workaround that provides an immediate, effective workaround to help block known attacks."

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2014-1776?

It affects 1 product.


Products: Microsoft Internet Explorer.

## How do I fix CVE-2014-1776?

No fix has been published for CVE-2014-1776 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 28 Jul 2022.

## Is CVE-2014-1776 being exploited?

Yes. Attackers have exploited CVE-2014-1776 in the wild since at least 28 Jan 2022.

## Other vulnerabilities in Microsoft Internet Explorer

- [CVE-2021-27085](https://insights.sbomify.com/CVE-2021-27085/): Microsoft Internet Explorer Remote Code Execution (high 8.8, exploited in the wild)
- [CVE-2017-0222](https://insights.sbomify.com/CVE-2017-0222/): Microsoft Internet Explorer Remote Code Execution (high 8.8, exploited in the wild)
- [CVE-2017-0210](https://insights.sbomify.com/CVE-2017-0210/): Microsoft Internet Explorer Privilege Escalation (high 8.8, exploited in the wild)
- [CVE-2017-0149](https://insights.sbomify.com/CVE-2017-0149/): Microsoft Internet Explorer Memory Corruption (high 8.8, exploited in the wild)
- [CVE-2015-2502](https://insights.sbomify.com/CVE-2015-2502/): Microsoft Internet Explorer Memory Corruption (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2014-1776 and fix it if it is affected.

What it is: CVE-2014-1776 is a critical use after free vulnerability in Microsoft Internet Explorer, published on 27 Apr 2014. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2014-1776 in the wild since at least 28 Jan 2022.

Affected product: Microsoft Internet Explorer. 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-2014-1776/ (Markdown: https://insights.sbomify.com/CVE-2014-1776/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2014-1776
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2014-1776
- OSV: https://osv.dev/vulnerability/CVE-2014-1776

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From sbomify Insights: https://insights.sbomify.com/CVE-2014-1776/
Summaries are generated and may contain mistakes; the official description above is the record.