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

> CVE-2014-1776: Microsoft Internet Explorer Memory Corruption Vulnerability. CVSS 9.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2014-1776
Last updated: 2025-10-22T00:05:37Z

- Published: 2014-04-27 10:00 UTC · Updated: 2025-10-22 00:05 UTC · Assigner: microsoft
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 82.7%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2022-01-28, federal due date 2022-07-28, ransomware use: Unknown

## 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."

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Microsoft: Internet Explorer

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2014-1776)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2014-1776)
- [http://blogs.technet.com/b/srd/archive/2014/04/30/protection-strategies-for-the-security-advisory-2963983-ie-0day.aspx](http://blogs.technet.com/b/srd/archive/2014/04/30/protection-strategies-for-the-security-advisory-2963983-ie-0day.aspx)
- [https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-021](https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-021)
- [http://secunia.com/advisories/57908](http://secunia.com/advisories/57908)
- [http://securitytracker.com/id?1030154](http://securitytracker.com/id?1030154)
- [https://technet.microsoft.com/library/security/2963983](https://technet.microsoft.com/library/security/2963983)
- [http://www.fireeye.com/blog/uncategorized/2014/04/new-zero-day-exploit-targeting-internet-explorer-versions-9-through-11-identified-in-targeted-attacks.html](http://www.fireeye.com/blog/uncategorized/2014/04/new-zero-day-exploit-targeting-internet-explorer-versions-9-through-11-identified-in-targeted-attacks.html)
- [http://www.kb.cert.org/vuls/id/222929](http://www.kb.cert.org/vuls/id/222929)
- [http://www.osvdb.org/106311](http://www.osvdb.org/106311)
- [http://www.securityfocus.com/bid/67075](http://www.securityfocus.com/bid/67075)
- [http://www.signalsec.com/cve-2014-1776-ie-0day-analysis/](http://www.signalsec.com/cve-2014-1776-ie-0day-analysis/)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2014-1776 · Markdown: https://rewindex.com/cve/CVE-2014-1776.md · JSON: https://rewindex.com/api/v1/cves/CVE-2014-1776 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:44:10.375Z