Loading vulnerability…
CVE-2025-21394 is a remote code execution vulnerability in Microsoft Excel. It was addressed in Microsoft’s February 2025 security updates and is rated Important with a CVSS base score of 7.8. Available reporting identifies it as one of several Excel remote code execution flaws from that release that may be exploitable through the Preview Pane, indicating that specially crafted Office content can trigger code execution in the context of the affected application. Specific technical details about the underlying vulnerable function or memory corruption mechanism are not currently available in the provided information.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
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.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Excel remote code execution vulnerability that may be exploitable via Preview Pane and is one of several related Excel flaws patched this month.
A high-severity remote code execution vulnerability in Microsoft Excel mentioned in the broader list of February 2025 Microsoft vulnerabilities.
A remote code execution vulnerability in Microsoft Excel.
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.