CVE-2014-1776
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."
Key facts
- CVSS score
- 9.8 (v3.1)
- Severity
- CRITICAL
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
- CWE-416
- EPSS score
- 82.7% (100th percentile)
- In CISA KEV
- Yes, added January 28, 2022
- In EU EUVD
- Yes (EUVD-2014-1850)
- Published
- April 27, 2014
- NVD last modified
- June 17, 2026
- Status
- Analyzed
CISA Known Exploited Vulnerability
Microsoft Internet Explorer Memory Corruption Vulnerability
Added to the KEV catalog on January 28, 2022; federal remediation due July 28, 2022.
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2014-1850 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on October 22, 2025.
View on the EU Vulnerability DatabaseAffected products
- microsoft / internet explorer
- microsoft / internet explorer
- microsoft / internet explorer
- microsoft / internet explorer
- microsoft / internet explorer
- microsoft / internet explorer
- microsoft / windows 7
- microsoft / windows 8
- microsoft / windows 8.1
- microsoft / windows rt
- microsoft / windows rt 8.1
- microsoft / windows server 2003
- microsoft / windows server 2008
- microsoft / windows server 2008
- microsoft / windows server 2008
- microsoft / windows server 2012
- microsoft / windows server 2012
- microsoft / windows vista
- microsoft / windows xp
- microsoft / windows xp
References
- http://blogs.technet.com/b/srd/archive/2014/04/30/protection-strategies-for-the-security-advisory-2963983-ie-0day.aspx(Broken Link, Mitigation)
- http://secunia.com/advisories/57908(Broken Link)
- http://securitytracker.com/id?1030154(Broken Link, Third Party Advisory, VDB Entry)
- http://www.fireeye.com/blog/uncategorized/2014/04/new-zero-day-exploit-targeting-internet-explorer-versions-9-through-11-identified-in-targeted-attacks.html(Broken Link)
- http://www.kb.cert.org/vuls/id/222929(Mitigation, Third Party Advisory, US Government Resource)
- http://www.osvdb.org/106311(Broken Link)
- http://www.securityfocus.com/bid/67075(Broken Link, Third Party Advisory, VDB Entry)
- http://www.signalsec.com/cve-2014-1776-ie-0day-analysis/(Exploit, Third Party Advisory)
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-021(Patch, Vendor Advisory)
- https://technet.microsoft.com/library/security/2963983(Mitigation, Patch, Vendor Advisory)
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2014-1776(US Government Resource)
- https://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-detection-script(Third Party Advisory)
- https://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-mitigation-scripts(Third Party Advisory)
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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