Use-After-Free RCE in Microsoft Office
CVE-2025-59234 is a Microsoft Office remote code execution vulnerability caused by a use-after-free condition. The provided content states that the flaw affects Microsoft Office and can be triggered by opening a malicious file; multiple sources in the content also indicate exploitation may occur via the Office Preview Pane. The vulnerability arises from improper handling of object lifetime in Office, leading to dereference of freed memory and potential memory corruption. A successful exploit can allow an unauthorized attacker to execute code locally in the context of the user running the affected Office application.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Microsoft Office remote code execution vulnerability triggered by opening a malicious file.
A Microsoft Office remote code execution vulnerability exploitable via a malicious document (including via Preview Pane), enabling attacker code execution on the victim system.
A use-after-free vulnerability in Microsoft Office allowing local code execution if vulnerable content is present.
A remote code execution vulnerability in Microsoft Office that can be exploited via the Preview Pane, requiring only that a user previews a malicious document.
The version that knows your environment.
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.