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CVE-2025-21298 is a critical remote code execution vulnerability in Windows Object Linking and Embedding (OLE) as exposed through Microsoft Outlook’s handling of specially crafted email content, including RTF-based content. The flaw can be triggered when a target opens a malicious email or, more significantly, when Outlook renders the message in the Preview Pane, making exploitation effectively zero-click in common configurations. The issue affects Windows and Windows Server platforms using the vulnerable OLE functionality in conjunction with affected Outlook versions. Successful exploitation allows an unauthenticated remote attacker to execute arbitrary code on the victim system.
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No valid public exploits. Mallory filtered out 9 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical Windows OLE remote code execution vulnerability involving RTF content that can be triggered via the Preview Pane in email clients such as Outlook, enabling code execution from a malicious email without user clicks.
A critical Windows OLE remote code execution flaw involving RTF content that can be triggered via Outlook Preview Pane by sending a malicious email, making it highly dangerous and likely to be exploited soon.
A critical Windows OLE vulnerability allowing zero-click remote code execution via malicious RTF documents in Microsoft Outlook.
A critical remote code execution vulnerability in Windows OLE as used by Microsoft Outlook, exploitable via specially crafted email messages when previewed or opened.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.