Use-After-Free RCE in Microsoft Office
CVE-2025-49699 is a Microsoft Office remote code execution vulnerability caused by a use-after-free condition (CWE-416). Microsoft describes the issue as allowing an unauthorized attacker to execute code locally. Exploitation requires delivery of a malicious Office file to a target user and convincing that user to open it. Microsoft states the Preview Pane is not an attack vector for this vulnerability. The advisory characterizes the attack vector as local because the exploit is triggered on the victim system when the crafted file is opened, even though the attacker may be remote. Microsoft assigned CVSS 3.1 vector AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H and rated exploitation less likely.
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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
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Microsoft Office remote code execution vulnerability affecting Office/365 and additionally impacting Word, PowerPoint, and Outlook in product listings; Mac versions were also affected.
A use-after-free remote code execution vulnerability in Microsoft Office that allows an unauthorized attacker to execute code locally when a user opens a malicious Office file.
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.