CVE-2023-36563 [Exploited] | Microsoft WINDOWS 10 1507 Input Validation Bypass

CVE-2023-36563 is rated Critical Active Threat (81.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.83%). CISA KEV confirms active exploitation (added 2023-10-10) affecting Microsoft / WordPad. 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	2026-05-19	2.47%	2.83%	+0.36%
2	2025-11-21	37.79%	2.47%	-35.32%
3	2025-11-18	—	37.79%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-05-19

2.47%

2.83%

+0.36%

2025-11-21

37.79%

2.47%

-35.32%

2025-11-18

—

37.79%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.5	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N` 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:N) Data isn’t meaningfully altered or forged. Availability (A:N) Service keeps running; no real outage angle.	2.8	3.6	[email protected]
5.5	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. 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:N) Data isn’t meaningfully altered or forged. Availability (A:N) Service keeps running; no real outage angle.	1.8	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.5

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N 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:N): Data isn’t meaningfully altered or forged.
Availability (A:N): Service keeps running; no real outage angle.

2.8

3.6

[email protected]

5.5

3.1

MEDIUM

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

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:N): Data isn’t meaningfully altered or forged.
Availability (A:N): Service keeps running; no real outage angle.

1.8

3.6

[email protected]

Affected software / configurations for CVE-2023-36563

Vendor	Product	Version	Raw CPE
microsoft	windows_10_1507	< 10.0.10240.20232	cpe:2.3:o:microsoft:windows_10_1507::::::::
microsoft	windows_10_1607	< 10.0.14393.6351	cpe:2.3:o:microsoft:windows_10_1607:::::::x64:*
microsoft	windows_10_1607	< 10.0.14393.6351	cpe:2.3:o:microsoft:windows_10_1607:::::::x86:*
microsoft	windows_10_1809	< 10.0.17763.4974	cpe:2.3:o:microsoft:windows_10_1809::::::::
microsoft	windows_10_1809	< 10.0.17763.4974	cpe:2.3:o:microsoft:windows_10_1809:::::::arm64:*
microsoft	windows_10_1809	< 10.0.17763.4974	cpe:2.3:o:microsoft:windows_10_1809:::::::x64:*
microsoft	windows_10_1809	< 10.0.17763.4974	cpe:2.3:o:microsoft:windows_10_1809:::::::x86:*
microsoft	windows_10_21h2	< 10.0.19041.3570	cpe:2.3:o:microsoft:windows_10_21h2::::::::
microsoft	windows_10_22h2	< 10.0.19045.3570	cpe:2.3:o:microsoft:windows_10_22h2::::::::
microsoft	windows_11_21h2	< 10.0.22000.2538	cpe:2.3:o:microsoft:windows_11_21h2::::::::
microsoft	windows_11_22h2	< 10.0.22621.2428	cpe:2.3:o:microsoft:windows_11_22h2::::::::
microsoft	windows_server_2008	—	cpe:2.3:o:microsoft:windows_server_2008:-:sp2::::::
microsoft	windows_server_2008	r2	cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:::::x64:*
microsoft	windows_server_2012	—	cpe:2.3:o:microsoft:windows_server_2012:-:::::::*
microsoft	windows_server_2012	r2	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*
microsoft	windows_server_2016	< 10.0.14393.6351	cpe:2.3:o:microsoft:windows_server_2016::::::::
microsoft	windows_server_2019	< 10.0.17763.4974	cpe:2.3:o:microsoft:windows_server_2019::::::::
microsoft	windows_server_2022	< 10.0.20348.2031	cpe:2.3:o:microsoft:windows_server_2022::::::::

References for CVE-2023-36563

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36563	Patch Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-36563	US Government Resource

URL

CVE-2023-36563 | Microsoft WordPad Information Disclosure Vulnerability

CISA KEV Record for CVE-2023-36563

Exploit prediction scoring system (EPSS) score for CVE-2023-36563

Common vulnerability scoring system (CVSS) metrics for CVE-2023-36563

Weakness enumeration for CVE-2023-36563

Affected software / configurations for CVE-2023-36563

References for CVE-2023-36563