What is the CVSS score of CVE-2014-1776?

CVE-2014-1776 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 80.2%.

Which versions of Microsoft are affected by CVE-2014-1776?

Organizations using Microsoft Internet Explorer 6 face critical risk from CVE-2014-1776, a use-after-free vulnerability rated CVSS 9.8.. A patch is available.

Is there a public PoC exploit available for CVE-2014-1776?

Yes, a public proof-of-concept exploit is available for CVE-2014-1776. Prioritise patching immediately. EPSS: 80.2%.

How to fix or mitigate CVE-2014-1776?

Within 24 hours: Identify all affected systems running Microsoft Internet Explorer 6 and apply vendor patches immediately. If patching is delayed, consider network segmentation to limit exposure.

Microsoft CVE-2014-1776

CRITICAL

Use After Free (CWE-416)

2014-04-27 secure@microsoft.com

Buffer Overflow Memory Corruption Denial Of Service RCE Microsoft Use After Free

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Re-analysis Queued

Apr 21, 2026 - 15:22 vuln.today

cvss_changed

Analysis Generated

Mar 26, 2026 - 11:18 vuln.today

Added to CISA KEV

Oct 22, 2025 - 01:15 cisa

CISA KEV

PoC Detected

Oct 22, 2025 - 01:15 vuln.today

Public exploit code

Patch released

Oct 22, 2025 - 01:15 nvd

Patch available

CVE Published

Apr 27, 2014 - 10:55 nvd

CRITICAL 9.8

DescriptionCVE.org

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."

AnalysisAI

Internet Explorer 6 through 11 contain a use-after-free vulnerability in CMarkup::IsConnectedToPrimaryMarkup that allows remote code execution, exploited as a zero-day in April 2014 with initial attribution to APT groups.

Technical ContextAI

The CWE-416 use-after-free in the CMarkup::IsConnectedToPrimaryMarkup function is triggered when JavaScript manipulates the DOM to free a CMarkup object while IE still holds references to it. The vulnerability initially appeared to involve VGX.DLL (VML rendering) but was ultimately traced to the core HTML rendering engine.

RemediationAI

Migrate to modern browsers. This vulnerability's severity prompted Microsoft to issue a rare patch for end-of-life Windows XP. Apply MS14-021.

CVE-2014-1776 vulnerability details – vuln.today

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Microsoft CVE-2014-1776

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

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External POC / Exploit Code