CVE-2014-1776
CriticalExploitedPublic exploitUse-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…
Published Apr 27, 2014 · Updated Apr 21, 2026
Key Facts
Patch immediately- CVE-2014-1776 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Internet Explorer (Microsoft).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 27, 2014. Public exploit code is available.
- EPSS estimates a 83% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
83%
Higher than 99.6% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2014-1776 brief as a PDF
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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."
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Jan 28, 2022 | Jul 28, 2022 | Not reported |
| Industry KEV feed | Apr 27, 2014 | Jul 28, 2022 | Not reported |
| CIRCL KEV | Jan 28, 2022 | Jul 28, 2022 | Not reported |
| ENISA EUVD | Jan 28, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
6 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Internet ExplorerMicrosoft | 10, 11, 6, 7, 8, 9 | n/a |
Timeline
Publicly disclosed
Apr 27, 2014
Added to Industry KEV feed
Apr 27, 2014
Added to CISA KEV
Jan 28, 2022
Added to CIRCL KEV
Jan 28, 2022
Added to ENISA EUVD
Jan 28, 2022
Last updated
Apr 21, 2026
Weakness Type
- CWE-416 Use After Free
References
- advisory1030154
- advisoryhttps://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-detection-script
- advisoryhttps://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-mitigation-scripts
- advisoryVU#222929
- advisory67075
FAQ
Common Questions.
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.
Affected: Internet Explorer (Microsoft) versions 10, 11, 6, 7, 8, 9. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 27, 2014.
Yes. It was added on Jan 28, 2022 with a federal remediation due date of Jul 28, 2022.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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