CVE-2025-21295
Published: 14 January 2025
Summary
CVE-2025-21295 is a high-severity Use After Free (CWE-416) vulnerability in Microsoft Windows 10 1507. Its CVSS base score is 8.1 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation of Remote Services (T1210); ranked in the top 17.5% 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 SI-2 (Flaw Remediation) and SC-7 (Boundary Protection).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly remediates the SPNEGO NEGOEX remote code execution vulnerability (CVE-2025-21295) by requiring timely installation of vendor patches as specified in the Microsoft update guide.
Mitigates remote code execution exploitation of the use-after-free (CWE-416) flaw in NEGOEX by enforcing memory protections like ASLR and DEP to prevent arbitrary code execution.
Limits network-based exploitation of the unauthenticated remote vulnerability by monitoring and controlling communications at boundaries to restrict access to affected services.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The CVE describes an unauthenticated remote code execution vulnerability in the NEGOEX security mechanism with network attack vector and no user interaction, directly enabling exploitation of remote services.
NVD Description
SPNEGO Extended Negotiation (NEGOEX) Security Mechanism Remote Code Execution Vulnerability
Deeper analysisAI
CVE-2025-21295 is a Remote Code Execution vulnerability in the SPNEGO Extended Negotiation (NEGOEX) Security Mechanism, published on 2025-01-14. It carries a CVSS v3.1 base score of 8.1 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H) and is associated with CWE-416, with additional NVD-CWE-noinfo mapping. The vulnerability affects the NEGOEX security mechanism, as detailed in the Microsoft Security Response Center advisory.
Attackers can exploit this vulnerability over the network without authentication privileges or user interaction, though it requires high attack complexity. Successful exploitation enables remote code execution with high impacts on confidentiality, integrity, and availability in the security context.
The Microsoft update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21295 provides details on affected software, exploitation status, and recommended mitigations or patches.
Details
- CWE(s)