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CVE-2012-4776

9.3 · HIGH

The Web Proxy Auto-Discovery (WPAD) functionality in Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, and 4.5 does not validate configuration data that is returned during acquisition of proxy setti…

Published Nov 14, 2012microsoftCWE-20EPSS 24.75%

Overview

CVE-2012-4776 is a high-severity vulnerability affecting microsoft .net_framework. It was published on November 14, 2012 and has a CVSS 2.0 base score of 9.3 (HIGH).

This vulnerability has a CVSS 2.0 base score of 9.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The Web Proxy Auto-Discovery (WPAD) functionality in Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, and 4.5 does not validate configuration data that is returned during acquisition of proxy settings, which allows remote attackers to execute arbitrary JavaScript code by providing crafted data during execution of (1) an XAML browser application (aka XBAP) or (2) a .NET Framework application, aka "Web Proxy Auto-Discovery Vulnerability."

Remediation

Check the references section for vendor advisories and patches from microsoft. Update .net_framework to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refosvdb.org/87266Refsecunia.com/advisories/51236Refwww.securityfocus.com/bid/56463Refwww.securitytracker.com/id?1027753Refwww.us-cert.gov/cas/techalerts/TA12-318A.htmlRefdocs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-074Refoval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15810Refosvdb.org/87266Refsecunia.com/advisories/51236Refwww.securityfocus.com/bid/56463

How CyberStrike helps

Frequently asked questions

What is CVE-2012-4776?

CVE-2012-4776 is a high-severity vulnerability affecting microsoft .net_framework. It was published on November 14, 2012 and has a CVSS 2.0 base score of 9.3 (HIGH).

How severe is CVE-2012-4776?

This vulnerability has a CVSS 2.0 base score of 9.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2012-4776?

Check the references section for vendor advisories and patches from microsoft. Update .net_framework to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2012-4776?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2012-4776 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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