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."
CVE-2012-4776
NONECVSS 0.0Elevated
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: 25%CVSS: —Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- —
- EG Score
- 0.0(none)
- EPSS
- 97.6%
- KEV
- Not listed
Published
November 14, 2012
Last Modified
April 29, 2026
References (14)
- secure@microsofthttp://osvdb.org/87266
- secure@microsofthttp://secunia.com/advisories/51236
- secure@microsofthttp://www.securityfocus.com/bid/56463
- secure@microsofthttp://www.securitytracker.com/id?1027753
- secure@microsofthttp://www.us-cert.gov/cas/techalerts/TA12-318A.html
- secure@microsofthttps://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-074
- secure@microsofthttps://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15810
- af854a3a-2127-422b-91ae-364da2661108http://osvdb.org/87266
- af854a3a-2127-422b-91ae-364da2661108http://secunia.com/advisories/51236
- af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/56463
- af854a3a-2127-422b-91ae-364da2661108http://www.securitytracker.com/id?1027753
- af854a3a-2127-422b-91ae-364da2661108http://www.us-cert.gov/cas/techalerts/TA12-318A.html
- af854a3a-2127-422b-91ae-364da2661108https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-074
- af854a3a-2127-422b-91ae-364da2661108https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15810
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- CVE-2005-0116NVD 0.0EG 9.0EPSS 99%NONE
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- CVE-2000-0380NVD 0.0EG 9.0EPSS 98%NONE
- CVE-2000-0258EG 7.5EPSS 97%HIGH
- CVE-2004-2771EG 0.0EPSS 93%NONE
- CVE-2002-2443EG 0.0EPSS 93%NONE
- CVE-2002-2433EG 0.0NONE
- CVE-2003-1569EG 0.0NONE
- CVE-2003-1568EG 0.0NONE
Frequently asked(4)
What is CVE-2012-4776?
CVE-2012-4776 is a none vulnerability published on November 14, 2012. 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…
When was CVE-2012-4776 disclosed?
CVE-2012-4776 was first published in the National Vulnerability Database on November 14, 2012, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2012-4776 actively exploited?
CVE-2012-4776 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 97.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2012-4776?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2012-4776, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
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