# 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."

- Page: https://www.vulneraibility.com/cve/CVE-2014-1776
- CVSS: 9.8
- Known exploited: yes, in CISA KEV since 2022-01-28; CISA due date 2022-07-28
- EPSS: 82.68% (percentile 99.7)
- CISA SSVC: exploitation active, automatable yes, technical impact total (assessed 2025-02-10)
- Weakness: CWE-416
- Published: 2014-04-27

## Affected

- microsoft:internet_explorer

## References

- [other] http://securitytracker.com/id?1030154
- [other] http://www.osvdb.org/106311
- [advisory] https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-021
- [other] http://blogs.technet.com/b/srd/archive/2014/04/30/protection-strategies-for-the-security-advisory-2963983-ie-0day.aspx
- [advisory] http://secunia.com/advisories/57908
- [other] http://www.signalsec.com/cve-2014-1776-ie-0day-analysis/
- [other] http://www.fireeye.com/blog/uncategorized/2014/04/new-zero-day-exploit-targeting-internet-explorer-versions-9-through-11-identified-in-targeted-attacks.html
- [advisory] http://www.kb.cert.org/vuls/id/222929
- [other] https://technet.microsoft.com/library/security/2963983
- [other] http://www.securityfocus.com/bid/67075
- [other] https://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-mitigation-scripts
- [other] https://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-detection-script
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2014-1776

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.