Microsoft Net Framework 4.0 V 30319 Vulnerabilities ((hot)) Jun 2026
Critical (CVSS 8.2) Affected Components: .NET Framework’s SOAP WSDL parser.
Are you managing an application that , or are you auditing an existing environment? What operating system is currently hosting this runtime? Is the affected application exposed to the public internet ?
Similar to CVE-2020-0646, this remote code execution flaw arises when .NET Framework mishandles input processing. To exploit the vulnerability, an attacker would need to upload a specially crafted file to a vulnerable web application. It was fixed in the August 2020 Security Update. microsoft net framework 4.0 v 30319 vulnerabilities
Several vulnerabilities targeted the ASP.NET subsystem, compromising user identity and data integrity. Forms Authentication Bypass (CVE-2011-3416):
Understanding Security Vulnerabilities in Microsoft .NET Framework 4.0 (v4.0.30319) Critical (CVSS 8
Authenticated users could gain access to arbitrary user accounts by crafting specially formatted usernames, undermining the entire authentication control system. ASP.NET Information Disclosure:
Several critical Common Vulnerabilities and Exposures (CVEs) directly impact systems running .NET Framework 4.0. CVE-2017-8759: Remote Code Execution (RCE) Is the affected application exposed to the public internet
Ensure all XML parsers explicitly disable external entity resolution. For legacy XmlTextReader instances, configure the settings programmatically:
4. Cryptographic Padding Oracle / Information Disclosure (MS10-070) CLR 4.0.30319 vulnerabilities - asp.net - Stack Overflow
The (specifically the Common Language Runtime or CLR version v4.0.30319 ) has been a staple in Windows application development for over a decade. However, because it is an older technology, the framework's security posture requires careful attention. As of 2026, many security professionals and developers often find vulnerabilities reported against this specific CLR version, creating confusion about its security.
Critical (CVSS 8.2) Affected Components: .NET Framework’s SOAP WSDL parser.
Are you managing an application that , or are you auditing an existing environment? What operating system is currently hosting this runtime? Is the affected application exposed to the public internet ?
Similar to CVE-2020-0646, this remote code execution flaw arises when .NET Framework mishandles input processing. To exploit the vulnerability, an attacker would need to upload a specially crafted file to a vulnerable web application. It was fixed in the August 2020 Security Update.
Several vulnerabilities targeted the ASP.NET subsystem, compromising user identity and data integrity. Forms Authentication Bypass (CVE-2011-3416):
Understanding Security Vulnerabilities in Microsoft .NET Framework 4.0 (v4.0.30319)
Authenticated users could gain access to arbitrary user accounts by crafting specially formatted usernames, undermining the entire authentication control system. ASP.NET Information Disclosure:
Several critical Common Vulnerabilities and Exposures (CVEs) directly impact systems running .NET Framework 4.0. CVE-2017-8759: Remote Code Execution (RCE)
Ensure all XML parsers explicitly disable external entity resolution. For legacy XmlTextReader instances, configure the settings programmatically:
4. Cryptographic Padding Oracle / Information Disclosure (MS10-070) CLR 4.0.30319 vulnerabilities - asp.net - Stack Overflow
The (specifically the Common Language Runtime or CLR version v4.0.30319 ) has been a staple in Windows application development for over a decade. However, because it is an older technology, the framework's security posture requires careful attention. As of 2026, many security professionals and developers often find vulnerabilities reported against this specific CLR version, creating confusion about its security.