Cyber Resilience

CVE-2026-50307

Memory Safety in Microsoft Windows 10 21H2 ≤ 10.0.19044.7548

Memory Safety
Published
14 July 2026
Modified
22 July 2026
Patch / advisory
View advisory
CVSS Score v3.1 7.0
Click a component to see what it means
Raw vectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0020 10th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-50307 is a high-severity Use After Free (CWE-416) vulnerability in Microsoft Windows 10 21H2. Its CVSS base score is 7.0 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 10th 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 AC-6 (Least Privilege) and SI-16 (Memory Protection) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

Use after free in Windows TCP/IP allows an authorized attacker to elevate privileges locally.

CWE(s)
CWE-416

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
Why these techniques?

Use-after-free in Windows TCP/IP directly enables local privilege escalation via exploitation of a kernel-level vulnerability (CWE-416).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-58536Same product: Microsoft Windows 10 1809
CVE-2026-50374Same product: Microsoft Windows 10 1809
CVE-2026-58613Same product: Microsoft Windows 10 1809
CVE-2026-54114Same product: Microsoft Windows 10 1809
CVE-2026-50478Same product: Microsoft Windows 10 1809
CVE-2026-50493Same product: Microsoft Windows 10 1809
CVE-2026-49167Same product: Microsoft Windows 10 1809
CVE-2026-49795Same product: Microsoft Windows 10 1809
CVE-2026-50449Same product: Microsoft Windows 10 1809
CVE-2026-54129Same product: Microsoft Windows 10 1809

Affected Assets

microsoft
windows 10 1809
≤ 10.0.17763.9020 · ≤ 10.0.17763.9020
microsoft
windows 10 21h2
≤ 10.0.19044.7548 · ≤ 10.0.19044.7548 · ≤ 10.0.19044.7548
microsoft
windows 10 22h2
≤ 10.0.19045.7548 · ≤ 10.0.19045.7548 · ≤ 10.0.19045.7548
microsoft
windows 11 24h2
≤ 10.0.26100.8875 · ≤ 10.0.26100.8875
microsoft
windows 11 25h2
≤ 10.0.26200.8875 · ≤ 10.0.26200.8875
microsoft
windows 11 26h1
≤ 10.0.28000.2269 · ≤ 10.0.28000.2525
microsoft
windows server 2019
≤ 10.0.17763.9020
microsoft
windows server 2022
≤ 10.0.20348.5386
microsoft
windows server 2025
≤ 10.0.26100.33158

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)
Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 3 hardening rules · 3 OS baselines
Validate
Prove the fix (OWASP ASVS)
  • V1.4.3

Mitigating Controls (NIST 800-53 r5) AI

SI-16 Memory Protection good match
prevent

Directly implements memory protection safeguards that block use-after-free exploitation in kernel components such as TCP/IP.

AC-6 Least Privilege good match
prevent

Enforces least privilege so an authorized local attacker cannot escalate beyond the minimal rights needed to trigger the TCP/IP flaw.

SI-2 Flaw Remediation good match
prevent

Requires prompt installation of vendor patches that eliminate the specific use-after-free condition in the Windows TCP/IP stack.

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.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly incorporate memory-safety tooling and reviews that prevent most use-after-free defects.

ID.RA-01 partial match
prevents

Vulnerability identification processes can discover use-after-free issues via scanning or analysis but do not prevent their introduction.

PR.PS-02 partial match
prevents

Routine patching removes known use-after-free instances after they have been introduced in released 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.

A.8.29 Security testing in development and acceptance mostly match
detects

Security testing in development can detect use-after-free bugs before release.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC mandates memory-safety practices that reduce use-after-free defects.

A.8.26 Application security requirements partial match
prevents

Application security requirements can specify memory-management rules that mitigate use-after-free.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles include memory-safety design choices that limit use-after-free exposure.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly prescribe avoidance of use-after-free patterns.

A.8.32 Change management partial match
prevents

Change-management processes help ensure memory-safety fixes are deployed consistently.

References