Silverlight CVE-2012-0176

CRITICAL

Resource Management Errors (CWE-399)

2012-05-09 secure@microsoft.com

RCE Microsoft Silverlight

9.3

CVSS 2.0 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-399
Impact	CVSS score of 9.3 (CRITICAL). Attack characteristics: network attack vector, M complexity. EPSS exploitation probability: 62.11%.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the critical-severity affected system.

Emergency Immediate action required. Why: CRITICAL + EPSS > 30%, no patch available.

No patch listed yet 62.1% exploitation probability (EPSS)

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AnalysisAI

Double free vulnerability in Microsoft Silverlight 4 before 4.1.10329 on Windows allows remote attackers to execute arbitrary code via vectors involving crafted XAML glyphs, aka "Silverlight. Rated critical severity (CVSS 9.3), this vulnerability is remotely exploitable. Epss exploitation probability 62.1% and no vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

This vulnerability is classified under CWE-399. Double free vulnerability in Microsoft Silverlight 4 before 4.1.10329 on Windows allows remote attackers to execute arbitrary code via vectors involving crafted XAML glyphs, aka "Silverlight Double-Free Vulnerability." Affected products include: Microsoft Silverlight. Version information: before 4.1.10329.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.3 CRITICAL

AV:N/AC:M/Au:N/C:C/I:C/A:C

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

M

Confidentiality

C

Integrity

C

Availability

C

DescriptionCVE.org

Double free vulnerability in Microsoft Silverlight 4 before 4.1.10329 on Windows allows remote attackers to execute arbitrary code via vectors involving crafted XAML glyphs, aka "Silverlight Double-Free Vulnerability."

Threat Intelligence Overview

EPSS Score

62.1%

Top 2% exploitable

Data Quality

3 sources

Confidence: Low

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC No

EPSS 62.1%

Patch available No

Active threat No

Deciding rule

CRITICAL + EPSS > 30%, no patch available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

No

Human Impact· derived

Medium

Priority Score

108

Low Medium High Critical

KEV: 0

EPSS: +62

CVSS: +46

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

Affected Products (CPE)CVE.org

cpe:2.3:a:microsoft:silverlight:4.0.50401.0:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:silverlight:4.0.50524.00:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:silverlight:4.0.50826.0:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:silverlight:4.0.50917.0:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:silverlight:4.0.51204.0:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:silverlight:4.0.60129.0:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:silverlight:4.0.60310.0:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:silverlight:4.0.60531.0:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:silverlight:4.0.60831.0:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:silverlight:4.0.603310.0:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:silverlight:4.1.10111:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:silverlight:4.1.10111.0:*:*:*:*:*:*:*

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References

Advisories & patches

REF http://secunia.com/advisories/49122 REF http://www.securityfocus.com/bid/53360 REF http://www.securitytracker.com/id?1027040 REF http://www.us-cert.gov/cas/techalerts/TA12-129A.html REF https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-034 REF https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15574

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