CVE-2025-59295
📋 TL;DR
A heap-based buffer overflow vulnerability in Internet Explorer allows remote attackers to execute arbitrary code on affected systems. This affects users running vulnerable versions of Internet Explorer, primarily on Windows systems. Attackers can exploit this over a network without authentication.
💻 Affected Systems
- Internet Explorer
📦 What is this software?
Windows 10 1507 by Microsoft
Windows 10 1507 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 11 22h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 24h2 by Microsoft
Windows 11 25h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise leading to data theft, ransomware deployment, or persistent backdoor installation across the network.
Likely Case
Initial foothold for lateral movement, credential harvesting, or deployment of malware payloads on individual systems.
If Mitigated
Limited impact due to network segmentation, application control, and endpoint protection blocking the exploit attempt.
🎯 Exploit Status
Exploitation requires network access and likely user interaction unless chained with other vulnerabilities. No public exploit code available at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific patch versions
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59295
Restart Required: Yes
Instructions:
1. Open Windows Update settings
2. Check for updates
3. Install all available security updates
4. Restart system when prompted
🔧 Temporary Workarounds
Disable Internet Explorer
windowsCompletely disable Internet Explorer through Group Policy or system settings
gpedit.msc -> Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Disable Internet Explorer
Enable Enhanced Protected Mode
windowsEnable Internet Explorer Enhanced Protected Mode to add sandboxing
Internet Options -> Advanced tab -> Enable Enhanced Protected Mode
🧯 If You Can't Patch
- Implement network segmentation to isolate systems running Internet Explorer
- Deploy application control to block Internet Explorer execution
🔍 How to Verify
Check if Vulnerable:
Check Internet Explorer version and compare against patched versions in Microsoft advisoryCheck Version:
reg query "HKLM\SOFTWARE\Microsoft\Internet Explorer" /v VersionVerify Fix Applied:
Verify Windows Update history shows the relevant security update installed📡 Detection & Monitoring
Log Indicators:
- Internet Explorer crash logs with heap corruption signatures
- Process creation from Internet Explorer with unusual parameters
Network Indicators:
- Unusual outbound connections from Internet Explorer process
- HTTP requests to known malicious domains from IE
SIEM Query:
process_name:"iexplore.exe" AND (event_id:1000 OR event_id:1001) AND exception_code:0xc0000005