How severe is CVE-2026-68820?

CVE-2026-68820 has a CVSS 3.x base score of 7.0, rated high severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-68820 being actively exploited?

Yes. CVE-2026-68820 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-08-11, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2026-68820?

CVE-2026-68820 primarily affects Microsoft Windows 10 1607. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-68820?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

When was CVE-2026-68820 published?

CVE-2026-68820 was published on 2026-08-11 and last updated on 2026-08-16.

CVE-2026-68820

CVE-2026-68820 is a high-severity vulnerability in Microsoft Windows 10 1607 with a CVSS 3.x base score of 7.0. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-08-11). The underlying weakness is classified as CWE-416.

Key facts

Severity: High (CVSS 3.x base score 7.0)
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-08-11)
Weakness: CWE-416
Affected product: Microsoft Windows 10 1607
Published: 2026-08-11
Last modified: 2026-08-16

Description

Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Frequently asked questions

What is CVE-2026-68820?: Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
How severe is CVE-2026-68820?: CVE-2026-68820 has a CVSS 3.x base score of 7.0, rated high severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-68820 being actively exploited?: Yes. CVE-2026-68820 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-08-11, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-68820?: CVE-2026-68820 primarily affects Microsoft Windows 10 1607. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-68820?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
When was CVE-2026-68820 published?: CVE-2026-68820 was published on 2026-08-11 and last updated on 2026-08-16.

References

Affected products (16)

cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

More vulnerabilities in Microsoft Windows 10 1607

CVE-2026-57092 — Critical (CVSS 9.9): Use after free in Windows VMSwitch allows an authorized attacker to elevate privileges over a network.
CVE-2026-65791 — Critical (CVSS 9.8): Heap-based buffer overflow in Windows iSCSI Target Service allows an unauthorized attacker to execute code over a…
CVE-2026-62893 — Critical (CVSS 9.8): Use after free in Windows Deployment Services allows an unauthorized attacker to execute code over a network.
CVE-2026-62878 — Critical (CVSS 9.8): Stack-based buffer overflow in Windows DNS allows an unauthorized attacker to execute code over a network.
CVE-2026-56190 — Critical (CVSS 9.8): Use of uninitialized resource in Windows RDP allows an unauthorized attacker to execute code over a network.
CVE-2026-56188 — Critical (CVSS 9.8): Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Server Network…

All CVEs affecting Microsoft Windows 10 1607 →

Other CWE-416 (Use After Free) vulnerabilities

CVE-2026-63795 — Critical (CVSS 10.0): In the Linux kernel, the following vulnerability has been resolved: 9p: avoid putting oldfid in p9_client_walk() error…
CVE-2026-13782 — Critical (CVSS 10.0): Use after free in Browser in Google Chrome prior to 150.0.7871.47 allowed a remote attacker who had compromised the…
CVE-2026-4725 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149…
CVE-2026-4688 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox…
CVE-2025-24085 — Critical (CVSS 10.0): A use after free issue was addressed with improved memory management. This issue is fixed in iOS 18.3 and iPadOS 18.3,…
CVE-2024-43102 — Critical (CVSS 10.0): Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of…

Browse all CWE-416 (Use After Free) vulnerabilities →