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CVE-2021-24085 is a spoofing vulnerability in Microsoft Exchange Server. Publicly available context identifies the issue by Microsoft’s title and indicates vendor and network detection coverage, but does not provide technical detail about the vulnerable component, code path, protocol element, or the precise spoofing mechanism. The available information is therefore insufficient to accurately describe the vulnerable function or exploitation workflow beyond its classification as an Exchange Server spoofing issue.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides a multi-stage proof-of-concept exploit for CVE-2021-24085, a Cross Site Request Forgery (CSRF) Elevation of Privilege vulnerability in Microsoft Exchange Server. The exploit consists of three main components: 1. `poc.py` (Python): Authenticates to the Exchange OWA interface using provided credentials, locates the Exchange Auth Certificate, exports it (including the private key) to the server's filesystem, and downloads it to the attacker's machine. This step requires valid credentials and sufficient privileges. 2. `YellowCanary/Poc/Program.cs` (C#): A console application that, given a user SID, the exported certificate, and its password, generates a valid msExchEcpCanary CSRF token for the target user. This token is required to perform privileged actions via the Exchange Control Panel (ECP). 3. `poc.js` (JavaScript): A browser-based CSRF exploit that, using the generated token, uploads a malicious Office add-in manifest file to the Exchange server via a POST request to the UploadHandler endpoint. This can result in privilege escalation or account takeover if a privileged user visits the attacker's page. The repository is structured with a Visual Studio C# project for the token generator, standalone Python and JavaScript proof-of-concept scripts, and supporting documentation. The exploit demonstrates a full attack chain from credentialed access to privilege escalation via CSRF token forgery and malicious file upload. Multiple network endpoints and file paths are fingerprintable, including Exchange OWA and ECP URLs, and the location of the exported certificate.
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3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A named CVE included in the detection coverage section as related signature coverage, but not described as one of the primary Exchange zero-day vulnerabilities central to the article.
Specific vulnerability listed in the content with severity Important.
Specific named vulnerability listed in the content; no product or technical description is provided beyond severity/date and tabular flags.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.