CVE-2023-21823 [Exploited] | Microsoft WINDOWS 10 1507 Integer Overflow

CVE-2023-21823 is rated Critical Active Threat (91.6/100): CVSS High severity, with high exploitation likelihood (EPSS 5.56%, 92th percentile). CISA KEV confirms active exploitation (added 2023-02-14) affecting Microsoft / Windows. a weakness (CWE-190) Unauthenticated remote administrative access may be possible. EPSS rose +3.27% over the last day, indicating growing attacker interest. 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	2.29%	5.56%	+3.27%
2	2026-05-31	2.35%	2.29%	-0.06%
3	2026-05-12	—	2.35%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

2.29%

5.56%

+3.27%

2026-05-31

2.35%

2.29%

-0.06%

2026-05-12

—

2.35%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.8	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H` 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:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. 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.	1.8	5.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.8

3.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H 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:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
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.

1.8

5.9

[email protected]

Affected software / configurations for CVE-2023-21823

Vendor	Product	Version	Raw CPE
microsoft	windows_10_1507	< 10.0.10240.19747	cpe:2.3:o:microsoft:windows_10_1507:::::::x64:*
microsoft	windows_10_1507	< 10.0.10240.19747	cpe:2.3:o:microsoft:windows_10_1507:::::::x86:*
microsoft	windows_10_1607	< 10.0.14393.5717	cpe:2.3:o:microsoft:windows_10_1607:::::::x64:*
microsoft	windows_10_1607	< 10.0.14393.5717	cpe:2.3:o:microsoft:windows_10_1607:::::::x86:*
microsoft	windows_10_1809	< 10.0.17763.4010	cpe:2.3:o:microsoft:windows_10_1809:::::::arm64:*
microsoft	windows_10_1809	< 10.0.17763.4010	cpe:2.3:o:microsoft:windows_10_1809:::::::x64:*
microsoft	windows_10_1809	< 10.0.17763.4010	cpe:2.3:o:microsoft:windows_10_1809:::::::x86:*
microsoft	windows_10_20h2	< 10.0.19042.2604	cpe:2.3:o:microsoft:windows_10_20h2:::::::arm64:*
microsoft	windows_10_20h2	< 10.0.19042.2604	cpe:2.3:o:microsoft:windows_10_20h2:::::::x64:*
microsoft	windows_10_20h2	< 10.0.19042.2604	cpe:2.3:o:microsoft:windows_10_20h2:::::::x86:*
microsoft	windows_10_21h2	< 10.0.19044.2604	cpe:2.3:o:microsoft:windows_10_21h2:::::::arm64:*
microsoft	windows_10_21h2	< 10.0.19044.2604	cpe:2.3:o:microsoft:windows_10_21h2:::::::x64:*
microsoft	windows_10_21h2	< 10.0.19044.2604	cpe:2.3:o:microsoft:windows_10_21h2:::::::x86:*
microsoft	windows_10_22h2	< 10.0.19045.2604	cpe:2.3:o:microsoft:windows_10_22h2:::::::arm64:*
microsoft	windows_10_22h2	< 10.0.19045.2604	cpe:2.3:o:microsoft:windows_10_22h2:::::::x64:*
microsoft	windows_10_22h2	< 10.0.19045.2604	cpe:2.3:o:microsoft:windows_10_22h2:::::::x86:*
microsoft	windows_11_21h2	< 10.0.22000.1574	cpe:2.3:o:microsoft:windows_11_21h2:::::::arm64:*
microsoft	windows_11_21h2	< 10.0.22000.1574	cpe:2.3:o:microsoft:windows_11_21h2:::::::x64:*
microsoft	windows_11_22h2	< 10.0.22621.1265	cpe:2.3:o:microsoft:windows_11_22h2:::::::arm64:*
microsoft	windows_11_22h2	< 10.0.22621.1265	cpe:2.3:o:microsoft:windows_11_22h2:::::::x64:*
microsoft	windows_server_2008	—	cpe:2.3:o:microsoft:windows_server_2008:-:sp2:::::x64:*
microsoft	windows_server_2008	—	cpe:2.3:o:microsoft:windows_server_2008:-:sp2:::::x86:*
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	—	cpe:2.3:o:microsoft:windows_server_2016:-:::::::*
microsoft	windows_server_2019	—	cpe:2.3:o:microsoft:windows_server_2019:-:::::::*
microsoft	windows_server_2022	—	cpe:2.3:o:microsoft:windows_server_2022:-:::::::*

References for CVE-2023-21823

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21823	Patch Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-21823	US Government Resource

URL

CVE-2023-21823 | Windows Graphics Component Remote Code Execution Vulnerability

CISA KEV Record for CVE-2023-21823

Exploit prediction scoring system (EPSS) score for CVE-2023-21823

Common vulnerability scoring system (CVSS) metrics for CVE-2023-21823

Weakness enumeration for CVE-2023-21823

Affected software / configurations for CVE-2023-21823

References for CVE-2023-21823