How severe is CVE-2025-30400?

CVE-2025-30400 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-30400 being actively exploited?

Yes. CVE-2025-30400 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-05-13, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2025-30400?

CVE-2025-30400 primarily affects Microsoft Windows 10 1809. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-30400?

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.

Does CVE-2025-30400 have an EU (EUVD) identifier?

Yes. CVE-2025-30400 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14444. It is also flagged as exploited in the EUVD (since 2025-05-13).

When was CVE-2025-30400 published?

CVE-2025-30400 was published on 2025-05-13 and last updated on 2026-06-17.

CVE-2025-30400

CVE-2025-30400 is a high-severity vulnerability in Microsoft Windows 10 1809 with a CVSS 3.x base score of 7.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2025-05-13). The underlying weakness is classified as CWE-416.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2025-05-13)
EU (EUVD) id: EUVD-2025-14444
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2025-05-13)
Weakness: CWE-416
Affected product: Microsoft Windows 10 1809
Published: 2025-05-13
Last modified: 2026-06-17

Description

Use after free in Windows DWM allows an authorized attacker to elevate privileges locally.

Frequently asked questions

What is CVE-2025-30400?: Use after free in Windows DWM allows an authorized attacker to elevate privileges locally.
How severe is CVE-2025-30400?: CVE-2025-30400 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-30400 being actively exploited?: Yes. CVE-2025-30400 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-05-13, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2025-30400?: CVE-2025-30400 primarily affects Microsoft Windows 10 1809. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-30400?: 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.
Does CVE-2025-30400 have an EU (EUVD) identifier?: Yes. CVE-2025-30400 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14444. It is also flagged as exploited in the EUVD (since 2025-05-13).
When was CVE-2025-30400 published?: CVE-2025-30400 was published on 2025-05-13 and last updated on 2026-06-17.

References

Affected products (11)

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_22h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

More vulnerabilities in Microsoft Windows 10 1809

CVE-2025-49708 — Critical (CVSS 9.9): Use after free in Microsoft Graphics Component allows an authorized attacker to elevate privileges over a network.
CVE-2026-47291 — Critical (CVSS 9.8): Integer overflow or wraparound in Windows HTTP.sys allows an unauthorized attacker to execute code over a network.
CVE-2026-44815 — Critical (CVSS 9.8): Stack-based buffer overflow in Windows DHCP Client allows an unauthorized attacker to execute code over a network.
CVE-2026-33824 — Critical (CVSS 9.8): Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.
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Other CWE-416 (Use After Free) vulnerabilities

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…
CVE-2021-32495 — Critical (CVSS 10.0): Radare2 has a use-after-free vulnerability in pyc parser's get_none_object function. Attacker can read freed memory…

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