CVE-2025-27477
Published: 08 April 2025
Summary
CVE-2025-27477 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, ranked in the top 12.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
A heap-based buffer overflow vulnerability, tracked as CVE-2025-27477 and assigned CWE-122 and CWE-787, affects the Windows Telephony Service. The flaw carries a CVSS 3.1 score of 8.8 and permits remote code execution when triggered over a network.
An unauthorized attacker can exploit the issue without authentication, though user interaction is required. Successful exploitation grants the attacker the ability to execute arbitrary code with the privileges of the Telephony Service, potentially leading to full system compromise.
Microsoft's advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-27477 addresses the vulnerability and supplies patch information for affected Windows versions. The associated EPSS score remains low, with a current value of 0.0332 and a peak of 0.0389.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-10182
Vulnerability details
Heap-based buffer overflow in Windows Telephony Service allows an unauthorized attacker to execute code over a network.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.