CVE-2014-1776

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Summary

CVECVE-2014-1776
StatePUBLISHED
Assignermicrosoft
Source PriorityCVE Program / NVD first with legacy fallback
Published2014-04-27 10:55:03 UTC
Updated2026-04-21 19:02:57 UTC
DescriptionUse-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."

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.880130000 probability, percentile 0.997500000 (date 2026-07-21)

CISA KEV: Listed on 2022-01-28; due 2022-07-28; ransomware use Unknown

Problem Types: CWE-416 | n/a | CWE-416 CWE-416 Use After Free

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2.0[email protected]Primary10AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:L/Au:N/C:C/I:C/A:C

CISA Known Exploited Vulnerability

VendorMicrosoft
ProductInternet Explorer
NameMicrosoft Internet Explorer Memory Corruption Vulnerability
Required ActionApply updates per vendor instructions.
Noteshttps://learn.microsoft.com/en-us/security-updates/SecurityBulletins/2014/ms14-021?redirectedfrom=MSDN; https://nvd.nist.gov/vuln/detail/CVE-2014-1776

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Microsoft Internet Explorer 6 All All All
Application Microsoft Internet Explorer 7 All All All
Operating System Microsoft Windows Server 2003 - sp2 All All
Operating System Microsoft Windows Xp - sp2 All All
Operating System Microsoft Windows Xp - sp3 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Microsoft Internet Explorer CVE-2014-1776 Remote Code Execution Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com Broken Link, Third Party Advisory, VDB Entry
Microsoft Security Bulletin MS14-021 - Critical | Microsoft Docs af854a3a-2127-422b-91ae-364da2661108 docs.microsoft.com Patch, Vendor Advisory
VU#222929 - Microsoft Internet Explorer CMarkup use-after-free vulnerability af854a3a-2127-422b-91ae-364da2661108 www.kb.cert.org Mitigation, Third Party Advisory, US Government Resource
www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-... af854a3a-2127-422b-91ae-364da2661108 www.vicarius.io Third Party Advisory
www.osvdb.org/106311 af854a3a-2127-422b-91ae-364da2661108 www.osvdb.org Broken Link
Microsoft Security Advisory 2963983 af854a3a-2127-422b-91ae-364da2661108 technet.microsoft.com Mitigation, Patch, Vendor Advisory
Microsoft Internet Explorer Object Access Flaw Lets Remote Users Execute Arbitrary Code - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 securitytracker.com Broken Link, Third Party Advisory, VDB Entry
Protection strategies for the Security Advisory 2963983 IE 0day - Security Research & Defense - Site Home - TechNet Blogs af854a3a-2127-422b-91ae-364da2661108 blogs.technet.com Broken Link, Mitigation
CVE-2014-1776 (IE 0day) Analysis | SignalSEC Corp. af854a3a-2127-422b-91ae-364da2661108 www.signalsec.com Exploit, Third Party Advisory
www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-... af854a3a-2127-422b-91ae-364da2661108 www.vicarius.io Third Party Advisory
About Secunia Research | Flexera af854a3a-2127-422b-91ae-364da2661108 secunia.com Broken Link
www.cisa.gov/known-exploited-vulnerabilities-catalog 134c704f-9b21-4f2e-91b3-4a467353bcc0 www.cisa.gov US Government Resource
FireEye Blog - Threat Research and Analysis | FireEye af854a3a-2127-422b-91ae-364da2661108 www.fireeye.com Broken Link
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
CISA Known Exploited Vulnerabilities catalog CISA www.cisa.gov kev

Additional Advisory Data

SourceTimeEvent
ADP2022-01-28T00:00:00.000ZCVE-2014-1776 added to CISA KEV

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