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CVE-2021-42237 is an insecure deserialization vulnerability in Sitecore Experience Platform (XP) 7.5 Initial Release through 8.2 Update-7. A publicly accessible legacy reporting handler processes attacker-controlled XML parameters and passes serialized objects to .NET NetDataContractSerializer.ReadObject. Unsafe type resolution permits a deserialization gadget chain, such as TypeConfuseDelegate, to invoke operating-system commands.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a single Metasploit module targeting CVE-2021-42237, a pre-authentication deserialization remote code execution vulnerability in Sitecore Experience Platform (XP) versions 7.5 to 8.2.7 on Windows. The exploit abuses the Report.ashx handler, which is accessible without authentication, to send a maliciously crafted XML payload that triggers .NET deserialization via the NetDataContractSerializer. The module supports multiple payload types, including direct command execution, binary droppers, and PowerShell stagers, allowing for flexible post-exploitation. Upon successful exploitation, the attacker gains code execution as the IIS user (NT AUTHORITY\NETWORK SERVICE), with the possibility of further privilege escalation. The main fingerprintable endpoint is '/sitecore/shell/ClientBin/Reporting/Report.ashx'. The code is written in Ruby and is fully integrated into the Metasploit framework, making it weaponized and easy to use for penetration testers and attackers alike.
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5 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.