Microsoft · Internet Explorer
CVE-2014-1776
Microsoft Internet Explorer Memory Corruption Vulnerability
What it is
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."
CISA: Microsoft Internet Explorer contains a memory corruption vulnerability that allows remote attackers to execute code in the context of the current user.
What to do
Apply updates per vendor instructions.
Deadline for US federal agencies: July 28, 2022
- Added to the CISA list
- January 28, 2022
- Published
- April 27, 2014
- Severity
- Critical 9.8 CVSS 3.1
- Chance of attacks in the next 30 days (EPSS)
- 83% in the top 0.3% of all known vulnerabilities
- Weakness
- CWE-416
- More details
- NVD · CVE.org · CISA
All references (10)
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-021
- http://securitytracker.com/id?1030154
- http://www.osvdb.org/106311
- http://blogs.technet.com/b/srd/archive/2014/04/30/protection-strategies-for-the-security-advisory-2963983-ie-…
- http://secunia.com/advisories/57908
- http://www.signalsec.com/cve-2014-1776-ie-0day-analysis/
- http://www.fireeye.com/blog/uncategorized/2014/04/new-zero-day-exploit-targeting-internet-explorer-versions-9…
- http://www.kb.cert.org/vuls/id/222929
- https://technet.microsoft.com/library/security/2963983
- http://www.securityfocus.com/bid/67075
More exploited flaws from Microsoft
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| May 20, 2026 | Use-After-Free | Internet Explorer | High 8.8 | 92% |
| May 20, 2026 | Use-After-Free | Internet Explorer | High 8.8 | 82% |
| Oct 6, 2025 | Uninitialized Memory Corruption | Internet Explorer | High 8.1 | 97% |
| Aug 12, 2025 | Resource Management Errors | Internet Explorer | High 8.8 | 88% |
| Jul 23, 2024 | Use-After-Free | Internet Explorer | High 8.8 | 79% |
| Mar 30, 2023 | Memory Corruption | Internet Explorer | High 8.8 | 71% |
| Jun 8, 2022 | Use-After-Free | Internet Explorer | High 8.1 | 80% |
| May 25, 2022 | Information Disclosure | Internet Explorer | Medium 6.5 | 50% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.