CVE-2025-21205
Published: 08 April 2025
Summary
CVE-2025-21205 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 17.1% 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-2025-21205 and assigned CWE-122, affects the Windows Telephony Service. It was published on April 8, 2025 and carries a CVSS 3.1 score of 8.8 reflecting network attack vector, low attack complexity, no required privileges, and required user interaction, resulting in high impact to confidentiality, integrity, and availability.
An unauthorized remote attacker can exploit the flaw over a network to execute arbitrary code on affected Windows systems. The attack does not require authentication and can lead to full compromise of the target host when successful.
The Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21205 supplies official guidance on available patches and mitigation steps. The associated EPSS score remains low, with a current value of 0.0174 and a peak of 0.0205.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-10247
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
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.