CVEs / CVE-2014-1776

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

• Known exploited in the CISA KEV catalog since 28 Jan 2022
• high 10 CVSS 2.0 (NVD)
• EPSS 82.6% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
• Last changed at its sources 17 Jun 2026

Summary

Microsoft Internet Explorer contains a memory corruption vulnerability that allows remote attackers to execute code in the context of the current user.

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 and fixed versions

Exploitation

Severity

References

• CVE-2014-1776 on NVD
• CVE-2014-1776 in the CISA KEV catalog
• https://learn.microsoft.com/en-us/security-updates/SecurityBulletins/2014/ms14-021?redirectedfrom=MSDN (cited by CISA)
• 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.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
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2014-1776 US Government Resource