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How the CVE Works
CVE-2025-49663 exploits a heap-based buffer overflow in Windows Routing and Remote Access Service (RRAS). An attacker sends a specially crafted network packet to a vulnerable RRAS instance, triggering an overflow in a dynamically allocated memory buffer. This corruption allows arbitrary code execution with SYSTEM privileges due to RRAS running as a high-privileged service. The exploit bypasses standard memory protections (e.g., ASLR) by leveraging precise heap grooming techniques.
DailyCVE Form
Platform: Windows RRAS
Version: Windows Server 2019/2022
Vulnerability: Heap overflow
Severity: Critical
Date: 07/15/2025
Prediction: Patch by 08/05/2025
What Undercode Say
Analytics:
windbg !heap -p -a <corrupted_addr> msfconsole > use exploit/windows/rras/cve_2025_49663
How Exploit:
- Craft malicious packet via Scapy (IP/UDP layers).
- Spray heap to control overflow target.
- ROP chain to bypass DEP/ASLR.
Protection from this CVE:
- Disable RRAS if unused.
- Apply MS patch ASAP.
- Enable Control Flow Guard (CFG).
Impact:
- Remote SYSTEM compromise.
- Network propagation.
- Full infrastructure takeover.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
