# CVE-2014-1776

## Summary

- **CVE ID:** CVE-2014-1776
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Apr 27, 2014
- **Last Modified:** Sep 16, 2026

## 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."

## Affected Products

- n/a — n/a (n/a)

## References

- [CNA](http://securitytracker.com/id?1030154)
- [CNA](http://www.osvdb.org/106311)
- [CNA](https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-021)
- [CNA](http://blogs.technet.com/b/srd/archive/2014/04/30/protection-strategies-for-the-security-advisory-2963983-ie-0day.aspx)
- [CNA](http://secunia.com/advisories/57908)
- [CNA](http://www.signalsec.com/cve-2014-1776-ie-0day-analysis/)
- [CNA](http://www.fireeye.com/blog/uncategorized/2014/04/new-zero-day-exploit-targeting-internet-explorer-versions-9-through-11-identified-in-targeted-attacks.html)
- [CNA](http://www.kb.cert.org/vuls/id/222929)
- [CNA](https://technet.microsoft.com/library/security/2963983)
- [CNA](http://www.securityfocus.com/bid/67075)
- [CVE](https://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-mitigation-scripts)
- [CVE](https://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-detection-script)
- [CISA-ADP](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2014-1776)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 81.84%
- **EPSS Percentile:** 99.2

## Known Exploited Vulnerabilities (KEV)

- **Date Added:** Jan 28, 2022
- **Due Date:** Jul 28, 2022

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._