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CVE-2025-21362 is a remote code execution vulnerability in Microsoft Excel caused by a use-after-free condition. The flaw arises from reuse of memory after it has been freed, which can allow attacker-controlled data to influence program execution. Microsoft classified the issue as affecting Excel and associated it with remote code execution, with reporting indicating a CVSS score of 8.4. Successful exploitation would occur when Excel processes a specially crafted malicious file or content, leading to memory corruption and potential execution of attacker-supplied code in the context of the current user.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Microsoft Excel remote code execution vulnerability with available Sophos detection coverage and assessed by Microsoft as more likely to be exploited within 30 days.
A critical code execution vulnerability in Microsoft Excel caused by a use-after-free condition.
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.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.