Remote Code Execution in Microsoft Office Out-of-Bounds Read
CVE-2025-49696 is a Critical Microsoft Office vulnerability described by Microsoft as an out-of-bounds read that can lead to remote code execution. Supporting content also associates the issue with a heap-based buffer overflow condition. Microsoft states that an unauthorized attacker can execute code locally, while clarifying that the overall security impact is remote code execution/arbitrary code execution. The CVSS 3.1 vector is AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H with a base score of 8.4. The vulnerability affects Microsoft Office, including Windows editions and Mac editions such as Microsoft Office LTSC for Mac 2021 and 2024. The Preview Pane is confirmed as an attack vector, and multiple sources in the provided content state exploitation can occur without user interaction.
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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
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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
6 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, including Mac versions, with Preview Pane as an exploitation vector and higher likelihood of exploitation within 30 days.
A remote code execution vulnerability in Microsoft Office.
A high-risk Microsoft Office out-of-bounds read and heap-based buffer overflow vulnerability that could allow remote code execution without user interaction.
A critical remote code execution vulnerability in Microsoft Office that can be exploited via the preview pane without user interaction. Rated as more likely to be exploited.
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.