CVE-2025-29805
📋 TL;DR
CVE-2025-29805 is an information disclosure vulnerability in Outlook for Android that allows unauthorized attackers to access sensitive information over a network. This affects users of Outlook for Android who have the vulnerable version installed. The vulnerability exposes potentially confidential data to attackers who can reach the affected device.
💻 Affected Systems
- Microsoft Outlook for Android
📦 What is this software?
Outlook by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access sensitive emails, attachments, calendar entries, and contact information stored in Outlook, potentially leading to data breaches, corporate espionage, or identity theft.
Likely Case
Attackers could access recent emails, calendar appointments, and contact details, enabling social engineering attacks, credential harvesting, or business intelligence gathering.
If Mitigated
With proper network segmentation and access controls, impact would be limited to data accessible within the compromised user's Outlook account only.
🎯 Exploit Status
The vulnerability allows network-based exploitation without authentication, making it relatively easy to exploit if the attacker has network access to the device.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Latest version available in Google Play Store
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29805
Restart Required: No
Instructions:
1. Open Google Play Store on Android device. 2. Search for 'Microsoft Outlook'. 3. Tap 'Update' if available. 4. Alternatively, uninstall and reinstall the latest version.
🔧 Temporary Workarounds
Disable Outlook Network Access
androidTemporarily restrict Outlook's network access to prevent exploitation
Use Web Version
allSwitch to Outlook Web Access (OWA) via browser until patched
🧯 If You Can't Patch
- Implement strict network segmentation to isolate mobile devices from untrusted networks
- Use mobile device management (MDM) to enforce security policies and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check Outlook version in app settings: Settings > Help & Feedback > App VersionCheck Version:
Not applicable - check via app settings UIVerify Fix Applied:
Verify Outlook version is updated to latest from Google Play Store📡 Detection & Monitoring
Log Indicators:
- Unusual network connections from mobile devices to unknown IPs
- Multiple failed authentication attempts followed by successful data access
Network Indicators:
- Unexpected data exfiltration from mobile devices
- Suspicious network traffic patterns to/from Outlook app
SIEM Query:
source="mobile_device_logs" app="outlook" (event="data_access" OR event="network_connection") dest_ip!=corporate_network