CVE-2024-21409 [High] | Use-After-Free in .net Framework

CVE-2024-21409 is rated High Risk (68.6/100): CVSS High severity, with high exploitation likelihood (EPSS 57.62%, 98th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +6.28% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-05-11	51.34%	57.62%	+6.28%
2	2026-04-28	54.70%	51.34%	-3.35%
3	2025-11-21	—	54.70%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-05-11

51.34%

57.62%

+6.28%

2026-04-28

54.70%

51.34%

-3.35%

2025-11-21

—

54.70%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.3	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:R/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: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.	1.3	5.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.3

3.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/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: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.

1.3

5.9

[email protected]

OS Trackers for CVE-2024-21409

vendor	priority	summary	link
`alpine`	high	CVE-2024-21409: 5 source package rows (dotnet6-build, dotnet6-runtime, dotnet7-build, dotnet7-runtime, dotnet8-runtime); 12 state rows across 5 repos (3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 12, open 0.	https://security.alpinelinux.org/vuln/CVE-2024-21409
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2024-21409
`ubuntu`	medium	CVE-2024-21409 medium priority: Ubuntu including 3 source packages (dotnet6, dotnet7, dotnet8), 12 status rows across 4 suites (focal, jammy, mantic, upstream): not-affected 6, DNE 3, released 3.	https://ubuntu.com/security/CVE-2024-21409

Affected software / configurations for CVE-2024-21409

Vendor	Product	Version	Raw CPE
microsoft	.net_framework	3.5	cpe:2.3:a:microsoft:.net_framework:3.5:-::::::
microsoft	.net_framework	4.8.1	cpe:2.3:a:microsoft:.net_framework:4.8.1:::::::*
microsoft	.net	>= 6.0.0, < 6.0.29	cpe:2.3:a:microsoft:.net::::::::
microsoft	.net	>= 7.0.0, < 7.0.18	cpe:2.3:a:microsoft:.net::::::::
microsoft	.net	>= 8.0.0, < 8.0.4	cpe:2.3:a:microsoft:.net::::::::
microsoft	powershell	>= 7.2, < 7.2.19	cpe:2.3:a:microsoft:powershell::::::::
microsoft	powershell	>= 7.3, < 7.3.12	cpe:2.3:a:microsoft:powershell::::::::
microsoft	powershell	>= 7.4, < 7.4.2	cpe:2.3:a:microsoft:powershell::::::::
microsoft	visual_studio_2022	>= 17.4.0, < 17.4.18	cpe:2.3:a:microsoft:visual_studio_2022::::::::
microsoft	visual_studio_2022	>= 17.6.0, < 17.6.14	cpe:2.3:a:microsoft:visual_studio_2022::::::::
microsoft	visual_studio_2022	>= 17.8.0, < 17.8.9	cpe:2.3:a:microsoft:visual_studio_2022::::::::
microsoft	visual_studio_2022	>= 17.9.0, < 17.9.6	cpe:2.3:a:microsoft:visual_studio_2022::::::::
microsoft	.net_framework	4.7.2	cpe:2.3:a:microsoft:.net_framework:4.7.2:::::::*
microsoft	.net_framework	4.8	cpe:2.3:a:microsoft:.net_framework:4.8:::::::*
microsoft	.net_framework	4.6.2	cpe:2.3:a:microsoft:.net_framework:4.6.2:::::::*
microsoft	.net_framework	4.7	cpe:2.3:a:microsoft:.net_framework:4.7:::::::*
microsoft	.net_framework	4.7.1	cpe:2.3:a:microsoft:.net_framework:4.7.1:::::::*
microsoft	.net_framework	3.5	cpe:2.3:a:microsoft:.net_framework:3.5:::::::*

References for CVE-2024-21409

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21409	Vendor Advisory
https://security.netapp.com/advisory/ntap-20250117-0002/

URL

CVE-2024-21409 | .NET, .NET Framework, and Visual Studio Remote Code Execution Vulnerability

Exploit prediction scoring system (EPSS) score for CVE-2024-21409

Common vulnerability scoring system (CVSS) metrics for CVE-2024-21409

Weakness enumeration for CVE-2024-21409

GitHub Security Advisory for CVE-2024-21409

OS Trackers for CVE-2024-21409

Affected software / configurations for CVE-2024-21409

References for CVE-2024-21409