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 23.7% 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
The vulnerability CVE-2025-21233 is a remote code execution flaw affecting the Windows Telephony Service. It is tracked under CWE-122 and assigned a CVSS 3.1 base score of 8.8 reflecting network attack vector, low attack complexity, no required privileges, and required user interaction.
An unauthenticated attacker can exploit the issue remotely to execute arbitrary code, resulting in full impact to confidentiality, integrity, and availability on the affected system.
Microsoft's advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21233 provides details on available patches and mitigation guidance.
The associated EPSS score shows a current value of 0.0091 against a recorded peak of 0.0121.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-2300
Vulnerability details
Windows Telephony Service Remote Code Execution Vulnerability
- CWE(s)
Related Threats
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.
CVEs Like This One
Affected Assets
Mitigating Controls
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.