CVE-2024-30040 [Exploited] | Microsoft WINDOWS 10 1507 Input Validation Bypass

CVE-2024-30040 is rated Critical Active Threat (86.4/100): CVSS High severity, with medium exploitation likelihood (EPSS 3.94%). CISA KEV confirms active exploitation (added 2024-05-14) affecting Microsoft / Windows. a weakness (CWE-20) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	28.66%	3.94%	-24.72%
2	2026-06-02	23.49%	28.66%	+5.17%
3	2025-11-21	—	23.49%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

28.66%

3.94%

-24.72%

2026-06-02

23.49%

28.66%

+5.17%

2025-11-21

—

23.49%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.8	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	2.8	5.9	[email protected]
8.8	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	2.8	5.9	134c704f-9b21-4f2e-91b3-4a467353bcc0

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

8.8

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

2.8

5.9

[email protected]

8.8

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

2.8

5.9

134c704f-9b21-4f2e-91b3-4a467353bcc0

Affected software / configurations for CVE-2024-30040

Vendor	Product	Version	Raw CPE
microsoft	windows_10_1507	< 10.0.10240.20651	cpe:2.3:o:microsoft:windows_10_1507::::::::
microsoft	windows_10_1607	< 10.0.14393.6981	cpe:2.3:o:microsoft:windows_10_1607:::::::x64:*
microsoft	windows_10_1607	< 10.0.14393.6981	cpe:2.3:o:microsoft:windows_10_1607:::::::x86:*
microsoft	windows_10_1809	< 10.0.17763.5820	cpe:2.3:o:microsoft:windows_10_1809:::::::arm64:*
microsoft	windows_10_1809	< 10.0.17763.5820	cpe:2.3:o:microsoft:windows_10_1809:::::::x64:*
microsoft	windows_10_1809	< 10.0.17763.5820	cpe:2.3:o:microsoft:windows_10_1809:::::::x86:*
microsoft	windows_10_21h2	< 10.0.19044.4412	cpe:2.3:o:microsoft:windows_10_21h2::::::::
microsoft	windows_10_22h2	< 10.0.19045.4412	cpe:2.3:o:microsoft:windows_10_22h2::::::::
microsoft	windows_11_21h2	< 10.0.22000.2960	cpe:2.3:o:microsoft:windows_11_21h2::::::::
microsoft	windows_11_22h2	< 10.0.22621.3593	cpe:2.3:o:microsoft:windows_11_22h2::::::::
microsoft	windows_11_23h2	< 10.0.22631.3593	cpe:2.3:o:microsoft:windows_11_23h2::::::::
microsoft	windows_server_2016	< 10.0.14393.6981	cpe:2.3:o:microsoft:windows_server_2016::::::::
microsoft	windows_server_2019	< 10.0.17763.5820	cpe:2.3:o:microsoft:windows_server_2019::::::::
microsoft	windows_server_2022	< 10.0.20348.2458	cpe:2.3:o:microsoft:windows_server_2022::::::::
microsoft	windows_server_2022_23h2	< 10.0.25398.887	cpe:2.3:o:microsoft:windows_server_2022_23h2::::::::

References for CVE-2024-30040

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-30040	Patch Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-30040	US Government Resource

URL

CVE-2024-30040 | Windows MSHTML Platform Security Feature Bypass Vulnerability

CISA KEV Record for CVE-2024-30040

Exploit prediction scoring system (EPSS) score for CVE-2024-30040

Common vulnerability scoring system (CVSS) metrics for CVE-2024-30040

Weakness enumeration for CVE-2024-30040

Affected software / configurations for CVE-2024-30040

References for CVE-2024-30040