.NET SOAPwn Flaw (2025): Remote Code Execution via Rogue WSDL
In December 2025, security researchers at WatchTowr Labs revealed the 'SOAPwn' vulnerability (CVE-2025-34392 and CVE-2025-13659) impacting .NET Framework applications, including Barracuda Service Center RMM and Ivanti Endpoint Manager. Exploiting unsafe Web Services Description Language (WSDL) imports and HTTP client proxies, attackers could achieve remote code execution and arbitrary file writes on affected enterprise-grade systems. The flaw enabled threat actors to upload web shells, execute PowerShell scripts, or exfiltrate NTLM credentials via rogue SMB shares, potentially compromising entire application environments. Despite responsible disclosure, Microsoft stated the vulnerability is an application-level issue, leaving many unpatched systems at risk—especially those using components now at end-of-life such as Umbraco 8. This incident underscores the widespread risks associated with dynamic SOAP and WSDL usage in legacy frameworks and highlights attackers' growing focus on exploiting insecure software supply chains and overlooked application behaviors. The public disclosure has intensified scrutiny of web service integrations and spurred new urgency around secure coding practices in software built atop widely adopted frameworks.
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