CVE-2026-25177
Microsoft Windows 10 21H2 ≤ 10.0.19044.7058
Raw vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HSummary
CVE-2026-25177 is a high-severity Improper Restriction of Names for Files and Other Resources (CWE-641) vulnerability in Microsoft Windows 10 21H2. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Data from Local System (T1005); ranked in the top 34% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to SI-10 (Information Input Validation) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2026-25177 is a vulnerability in Active Directory Domain Services stemming from improper restriction of names for files and other resources, classified under CWE-641. It affects Microsoft Active Directory Domain Services, enabling an authorized attacker to elevate privileges over a network. The issue received a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating high severity due to its network accessibility, low complexity, and significant impacts on confidentiality, integrity, and availability.
An attacker with low privileges, such as an authenticated domain user, can exploit this vulnerability remotely without user interaction. Successful exploitation allows privilege escalation, potentially granting higher-level access within the Active Directory environment and compromising the domain's security.
Microsoft's Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-25177 provides details on mitigation strategies and available patches for addressing the vulnerability. Security practitioners should review the update guide promptly to apply relevant fixes.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-10647
Vulnerability Data
Improper restriction of names for files and other resources in Active Directory Domain Services allows an authorized attacker to elevate privileges over a network.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
SI-10 requires validation of inputs used to construct resource names, directly stopping malformed or dangerous names from being accepted.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Secure SDLC practices directly require input validation and sanitization to restrict resource names derived from untrusted data.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Security testing can detect improper filename handling but does not itself prevent the weakness.
Secure development life cycle mandates input validation and safe resource naming practices that directly prevent CWE-641.
Application security requirements include rules for handling untrusted input when constructing file or resource names.
Secure system architecture principles discourage unsafe resource naming but do not prescribe specific controls.
Secure coding standards explicitly require validation and sanitization of filenames derived from external input.