CVE-2014-1776

Name: CVE-2014-1776
Creator: NVD / NIST
Published: 2014-04-27T10:55:03.34+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10Actively ExploitedEPSS 88.01%

Last modified Jun 17, 2026

CVE-2014-1776 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 88.01% chance of exploitation in the next 30 days.

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."

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

88.01%

99.7th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Jul 28, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Microsoft	Internet Explorer	6
Microsoft	Internet Explorer	7
Microsoft	Internet Explorer	8
Microsoft	Internet Explorer	9
Microsoft	Internet Explorer	10
Microsoft	Internet Explorer	11

References

http://blogs.technet.com/b/srd/archive/2014/04/30/protection-strategies-for-the-security-advisory-2963983-ie-0day.aspxBroken Link, Mitigation
http://secunia.com/advisories/57908Broken Link
http://securitytracker.com/id?1030154Broken 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.htmlBroken Link
http://www.kb.cert.org/vuls/id/222929Mitigation, Third Party Advisory, US Government Resource
http://www.osvdb.org/106311Broken Link
http://www.securityfocus.com/bid/67075Broken 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/ms14-021Patch, Vendor Advisory
https://technet.microsoft.com/library/security/2963983Mitigation, Patch, Vendor Advisory
http://blogs.technet.com/b/srd/archive/2014/04/30/protection-strategies-for-the-security-advisory-2963983-ie-0day.aspxBroken Link, Mitigation
http://secunia.com/advisories/57908Broken Link
http://securitytracker.com/id?1030154Broken 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.htmlBroken Link
http://www.kb.cert.org/vuls/id/222929Mitigation, Third Party Advisory, US Government Resource
http://www.osvdb.org/106311Broken Link
http://www.securityfocus.com/bid/67075Broken 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/ms14-021Patch, Vendor Advisory
https://technet.microsoft.com/library/security/2963983Mitigation, Patch, Vendor Advisory
https://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-detection-scriptThird Party Advisory
https://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-mitigation-scriptsThird Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2014-1776US Government Resource

Timeline

Published: Apr 27, 2014
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2014-1776?

How severe is CVE-2014-1776?

CVE-2014-1776 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 88.01% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2014-1776?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2014-1776?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST