CVE-2025-49676
Published: 08 July 2025
Summary
CVE-2025-49676 is a high-severity Heap-based Buffer Overflow (CWE-122) vulnerability in Microsoft Windows Server 2008. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation of Remote Services (T1210); ranked in the top 26.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-16 (Memory Protection) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2025-49676 is a heap-based buffer overflow vulnerability (CWE-122) in the Windows Routing and Remote Access Service (RRAS). Published on 2025-07-08, it carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H), reflecting its high severity due to network accessibility, low attack complexity, and potential for significant impact.
An unauthorized attacker can exploit this vulnerability over a network without requiring privileges, though it necessitates user interaction. Successful exploitation enables arbitrary code execution on the target system.
The Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49676 provides details on mitigation, including available patches and recommended actions.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-20640
Vulnerability details
Heap-based buffer overflow in Windows Routing and Remote Access Service (RRAS) allows an unauthorized attacker to execute code over a network.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Heap buffer overflow in RRAS enables unauthenticated remote code execution via exploitation of the remote access service.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
SI-2 requires timely identification, reporting, and remediation of flaws such as the heap buffer overflow in RRAS, directly addressing the vulnerability through patching as recommended by Microsoft.
SI-16 implements memory protections like ASLR, DEP, and heap hardening that minimize the exploitability of heap-based buffer overflows leading to arbitrary code execution.
CM-7 enforces least functionality by prohibiting or restricting nonessential services like RRAS, reducing the attack surface for network-accessible vulnerabilities.