CVE-2025-21243
Published: 14 January 2025
Summary
CVE-2025-21243 is a high-severity Integer Overflow or Wraparound (CWE-190) vulnerability in Microsoft Windows 10 1507. 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 27.5% 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 CM-7 (Least Functionality) and SI-2 (Flaw Remediation).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly addresses the CVE by requiring timely remediation of the flaw in Windows Telephony Service through patching.
Eliminates the attack surface for this service-specific RCE vulnerability by disabling or restricting unnecessary Windows Telephony Service functionality.
Mitigates exploitation of the integer overflow leading to RCE via memory protections like DEP and ASLR.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
RCE in Windows Telephony Service enables direct exploitation of remote services (T1210) and client execution (T1203) via network vector with user interaction.
NVD Description
Windows Telephony Service Remote Code Execution Vulnerability
Deeper analysisAI
CVE-2025-21243 is a Remote Code Execution vulnerability affecting the Windows Telephony Service. Published on 2025-01-14T18:15:40.180, 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) and is associated with CWE-190 and NVD-CWE-noinfo.
The vulnerability enables remote exploitation over the network with low complexity and no required privileges, though it demands user interaction. An attacker who tricks a user into performing a specific action can achieve high-impact confidentiality, integrity, and availability effects, including remote code execution on the targeted system.
Mitigation details are available in the Microsoft Security Response Center update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21243.
Details
- CWE(s)