CVE-2025-47176: 
vulnerability analysis and mitigation

CVE-2025-47176 is a path traversal and command injection vulnerability in Microsoft Office Outlook that allows an authorized local attacker to execute arbitrary code. The flaw involves improper handling of .../...// path traversal sequences (CWE-35, CWE-22, CWE-77), enabling bypass of directory restrictions. Affected products include Microsoft Office 2024 LTSC (x86/x64), Microsoft 365 Apps for Enterprise (x86/x64), and Office Long Term Servicing Channel 2024. It was publicly disclosed and patched on June 10, 2025, as part of Microsoft's June 2025 Patch Tuesday. The vulnerability carries a CVSS v3.1 base score of 7.8 (High) (Microsoft MSRC).

The root cause is improper neutralization of special path elements — specifically the .../...// traversal sequence — within Microsoft Office Outlook's file handling logic, classified under CWE-35 (Path Traversal: .../...//), CWE-22 (Path Traversal), and CWE-77 (Command Injection). An attacker with low-privilege local access can craft malicious input using these sequences to escape restricted directories and trigger code execution without requiring user interaction. The attack vector is local with low attack complexity and no user interaction required, making it straightforward to exploit once local access is obtained. A public proof-of-concept exploit is available on GitHub and Exploit-DB (Microsoft MSRC, Feedly).

Successful exploitation results in complete compromise of the affected system's confidentiality, integrity, and availability, as the attacker can execute arbitrary code locally with the privileges of the Outlook process. This could enable an attacker to access sensitive data, modify or destroy files, install malware, or pivot to other systems on the network. The broad deployment of Microsoft 365 Apps for Enterprise and Office 2024 LTSC across enterprise environments significantly amplifies the potential blast radius (Microsoft MSRC, Morphisec).

1. Reconnaissance: Identify systems running vulnerable versions of Microsoft Office Outlook — specifically Microsoft 365 Apps for Enterprise, Office 2024 LTSC (x86/x64), or Office Long Term Servicing Channel 2024 — using asset inventory tools or local enumeration.
2. Gain local access: Obtain low-privilege local access to the target system (e.g., via phishing, credential theft, or existing foothold), as the vulnerability requires an authorized local attacker with low privileges.
3. Craft malicious path input: Construct a specially crafted input leveraging .../...// path traversal sequences designed to escape Outlook's restricted directory boundaries and reach arbitrary file system locations.
4. Trigger code execution: Supply the malicious path to the vulnerable Outlook component (e.g., via a crafted file, configuration, or local API call), causing Outlook to process the traversal sequence and execute attacker-controlled commands or code.
5. Achieve objective: With code execution achieved under the Outlook process context, deploy a payload (e.g., reverse shell, credential harvester, or persistence mechanism) to maintain access or escalate privileges (Feedly, Exploit-DB).

• Process: Unusual child processes spawned by OUTLOOK.EXE (e.g., cmd.exe, powershell.exe, wscript.exe, or network tools like curl.exe).
• File System: Unexpected files written outside normal Outlook data directories; presence of scripts or executables in temp directories associated with the Outlook process; new scheduled tasks or startup entries created by the Outlook user context.
• Logs: Windows Event Logs (Security/Application) showing process creation events (Event ID 4688) with OUTLOOK.EXE as parent process for unusual child processes; file access events involving .../...// path patterns.
• Network: Unexpected outbound network connections from OUTLOOK.EXE to external IPs or C2 infrastructure, particularly on non-standard ports.
• Detection Tools: Nessus plugin 240116 and Qualys QID 110497 can identify unpatched systems (Feedly).

Microsoft released patches on June 10, 2025 (June 2025 Patch Tuesday) addressing this vulnerability across all affected products: Microsoft 365 Apps for Enterprise (x86/x64), Microsoft Office 2024 LTSC (x86/x64), and Office Long Term Servicing Channel 2024 (x86/x64). Organizations should apply these updates immediately via Windows Update, Microsoft Update Catalog, or their patch management solution. As an interim measure, restrict local access to systems running affected Office versions and enforce the principle of least privilege for user accounts. Monitor for suspicious process activity originating from Outlook (Microsoft MSRC, Rapid7).

The vulnerability was covered as part of broader June 2025 Patch Tuesday reporting by multiple security outlets including BleepingComputer, Rapid7, Zero Day Initiative, Sophos, and GBHackers, which noted it among the 66+ CVEs addressed that month (BleepingComputer, ZDI). Morphisec published a dedicated blog post analyzing CVE-2025-47176 alongside CVE-2025-47171, highlighting the path traversal mechanism and urging immediate patching (Morphisec). Community discussion on Windows forums flagged it as a critical Outlook RCE risk. The subsequent publication of a PoC on Exploit-DB and GitHub generated additional attention on social platforms including Bluesky.