Raw vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2026-27907 is a high-severity Wrap or Wraparound (CWE-191) vulnerability in Microsoft Windows 11 23H2. Its CVSS base score is 7.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Network Devices (T1584.008); ranked at the 25th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SA-8 (Security and Privacy Engineering Principles) — 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-2026-27907, published on 2026-04-14, is an integer underflow vulnerability (CWE-191) in the Windows Storage Spaces Controller. This flaw enables an authorized attacker to elevate privileges locally and carries a CVSS v3.1 base score of 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating high impact on confidentiality, integrity, and availability.
A local attacker with low privileges (PR:L) can exploit the vulnerability with low attack complexity (AC:L) and no user interaction (UI:N). Successful exploitation allows privilege escalation, providing the attacker with unauthorized high-level access that compromises system confidentiality, integrity, and availability without changing scope.
For details on mitigations, patches, and remediation steps, security practitioners should consult the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27907.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-22445
Vulnerability Data
Integer underflow (wrap or wraparound) in Windows Storage Spaces Controller allows an authorized attacker to elevate privileges locally.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Developer testing and static/dynamic analysis directly find integer underflow defects before code is released.
Security engineering principles require use of safe arithmetic constructs or language features that structurally eliminate integer underflow during subtraction.
Input validation can reject or sanitize values that would cause a subtraction to underflow the representable range.
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 prevent integer underflow defects via input validation, bounds checking, and static analysis.
Vulnerability scanning and code analysis can surface underflow flaws after they are introduced.
Routine patching can remediate known underflow bugs once they are discovered in deployed software.
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 in development catches integer underflow defects before release.
Secure coding standards directly prescribe safe integer handling and overflow/underflow prevention.