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    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."

    Published:Apr 27, 2014
    Last Modified:Apr 21, 2026
    EPS:Apr 27, 2014
    EPSS Score:0.84024
    CVSS Score:9.8

    CISA Notification

    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."

    Required Action:

    Apply updates per vendor instructions.

    Notes:

    No extra notes provided.

    Due Date
    Jul 28, 2022
    1506 days ago
    Alert Date
    Jan 28, 2022
    1687 days ago

    Affected Products

    Vendor
    Microsoft
    Product
    Internet Explorer
    Vendor
    Microsoft
    Product
    Windows 7
    Vendor
    Microsoft
    Product
    Windows 8
    Vendor
    Microsoft
    Product
    Windows 8.1
    Vendor
    Microsoft
    Product
    Windows Rt
    Vendor
    Microsoft
    Product
    Windows Rt 8.1
    Vendor
    Microsoft
    Product
    Windows Server 2003
    Vendor
    Microsoft
    Product
    Windows Server 2008
    Vendor
    Microsoft
    Product
    Windows Server 2012
    Vendor
    Microsoft
    Product
    Windows Vista
    Vendor
    Microsoft
    Product
    Windows Xp

    Exploits

    http://www.signalsec.com/cve-2014-1776-ie-0day-analysis/http://www.signalsec.com/cve-2014-1776-ie-0day-analysis/

    Common Weakness Enumeration

    CWE-416 Use After Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2025-59295 (CVSS 8.8) — Heap-based buffer overflow in Internet Explorer allows an unauthorized attacker to execute code over a network…
    CVE-2021-35240 (CVSS 6.5) — A security researcher stored XSS via a Help Server setting. This affects customers using Internet Explorer, be…
    CVE-2021-26419 (CVSS 7.5) — Scripting Engine Memory Corruption Vulnerability…
    CVE-2021-27085 (CVSS 8.8) — Internet Explorer Remote Code Execution Vulnerability…
    CVE-2021-26411 (CVSS 8.8) — Internet Explorer Memory Corruption Vulnerability…
    CVE-2020-17058 (CVSS 7.5) — Microsoft Browser Memory Corruption Vulnerability…
    CVE-2020-17053 (CVSS 7.5) — Internet Explorer Memory Corruption Vulnerability…
    CVE-2020-17052 (CVSS 7.5) — Scripting Engine Memory Corruption Vulnerability…
    CVE-2020-1506 (CVSS 6.1) — <p>An elevation of privilege vulnerability exists in the way that the Wininit.dll handles objects in memory. A…
    CVE-2020-1012 (CVSS 8.8) — <p>An elevation of privilege vulnerability exists in the way that the Wininit.dll handles objects in memory. A…

    References

    http://blogs.technet.com/b/srd/archive/2014/04/30/protection-strategies-for-the-security-advisory-2963983-ie-0day.aspx
    http://secunia.com/advisories/57908
    http://securitytracker.com/id?1030154
    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.osvdb.org/106311
    http://www.securityfocus.com/bid/67075
    http://www.signalsec.com/cve-2014-1776-ie-0day-analysis/
    https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-021
    https://technet.microsoft.com/library/security/2963983
    http://blogs.technet.com/b/srd/archive/2014/04/30/protection-strategies-for-the-security-advisory-2963983-ie-0day.aspx
    http://secunia.com/advisories/57908
    http://securitytracker.com/id?1030154
    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.osvdb.org/106311
    http://www.securityfocus.com/bid/67075
    http://www.signalsec.com/cve-2014-1776-ie-0day-analysis/
    https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-021
    https://technet.microsoft.com/library/security/2963983
    https://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-detection-script
    https://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-mitigation-scripts
    https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2014-1776

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High