CVE-2025-21233
Published: 14 January 2025
Summary
CVE-2025-21233 is a high-severity Heap-based Buffer Overflow (CWE-122) vulnerability in Microsoft Windows 10 1507. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Client Execution (T1203); ranked in the top 28.6% 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).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly addresses the CVE by requiring timely patching of the specific RCE flaw in Windows Telephony Service as provided by Microsoft.
Deploys memory protection mechanisms such as ASLR and DEP to mitigate exploitation of the buffer overflow (CWE-122) enabling RCE.
Malicious code protection scans and blocks exploit payloads delivered via user-interacted malicious links or files targeting the telephony service.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
RCE vulnerability with network vector and explicit user interaction requirement directly maps to client-side exploitation for execution.
NVD Description
Windows Telephony Service Remote Code Execution Vulnerability
Deeper analysisAI
CVE-2025-21233 is a Remote Code Execution vulnerability affecting the Windows Telephony Service in Microsoft Windows operating systems. Published on 2025-01-14, 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 linked to CWE-122, with additional NVD-CWE-noinfo classification.
The vulnerability can be exploited by a remote unauthenticated attacker over the network with low attack complexity, though it requires user interaction such as clicking a malicious link or file. Successful exploitation enables the attacker to achieve high-impact effects, including unauthorized access to confidential data, modification of system integrity, and disruption of availability through arbitrary code execution, typically in the context of the affected service.
Microsoft has published an update guide addressing this vulnerability at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21233, which provides details on available patches and recommended mitigations for security practitioners.
Details
- CWE(s)