What’s Vulnerable › Vulnerabilities

CVE-2008-3843

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 22.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2008-08-27 · updated 2026-06-16
• Weakness: CWE-79

Description

Request Validation (aka the ValidateRequest filters) in ASP.NET in Microsoft .NET Framework with the MS07-040 update does not properly detect dangerous client input, which allows remote attackers to conduct cross-site scripting (XSS) attacks, as demonstrated by a query string containing a "<~/" (less-than tilde slash) sequence followed by a crafted STYLE element.

Affected products

• Microsoft .NET Framework: 1.0-sp3, 1.1-sp1, 2.0

References

• http://securityreason.com/securityalert/4193
• http://www.procheckup.com/PDFs/bypassing-dot-NET-ValidateRequest.pdf
• http://www.procheckup.com/Vulnerability_PR08-20.php
• http://www.securityfocus.com/archive/1/495667/100/0/threaded
• http://www.securityfocus.com/archive/1/496071/100/0/threaded
• https://exchange.xforce.ibmcloud.com/vulnerabilities/44743
• http://securityreason.com/securityalert/4193
• http://www.procheckup.com/PDFs/bypassing-dot-NET-ValidateRequest.pdf
• http://www.procheckup.com/Vulnerability_PR08-20.php
• http://www.securityfocus.com/archive/1/495667/100/0/threaded
• http://www.securityfocus.com/archive/1/496071/100/0/threaded
• https://exchange.xforce.ibmcloud.com/vulnerabilities/44743

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