How severe is CVE-2023-21808?

CVE-2023-21808 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-21808 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-21808?

CVE-2023-21808 primarily affects Microsoft .net. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-21808?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-21808 published?

CVE-2023-21808 was published on 2023-02-14 and last updated on 2026-06-17.

CVE-2023-21808

CVE-2023-21808 is a high-severity vulnerability in Microsoft .net with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-416
Affected product: Microsoft .net
Published: 2023-02-14
Last modified: 2026-06-17

Description

.NET and Visual Studio Remote Code Execution Vulnerability

Frequently asked questions

What is CVE-2023-21808?: .NET and Visual Studio Remote Code Execution Vulnerability
How severe is CVE-2023-21808?: CVE-2023-21808 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-21808 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-21808?: CVE-2023-21808 primarily affects Microsoft .net. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-21808?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-21808 published?: CVE-2023-21808 was published on 2023-02-14 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21808

Affected products (14)

cpe:2.3:a:microsoft:.net:6.0.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net:7.0.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:visual_studio_2022:17.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:visual_studio_2022:17.2:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:visual_studio_2022:17.4:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net_framework:3.5:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net_framework:4.8:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net_framework:4.7.2:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net_framework:4.8.1:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net_framework:4.6.2:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net_framework:4.7:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net_framework:4.7.1:*:*:*:*:*:*:*

More vulnerabilities in Microsoft .net

CVE-2024-43498 — Critical (CVSS 9.8): .NET and Visual Studio Remote Code Execution Vulnerability
CVE-2024-0057 — Critical (CVSS 9.1): NET, .NET Framework, and Visual Studio Security Feature Bypass Vulnerability
CVE-2025-21176 — High (CVSS 8.8): .NET, .NET Framework, and Visual Studio Remote Code Execution Vulnerability
CVE-2024-0056 — High (CVSS 8.7): Microsoft.Data.SqlClient and System.Data.SqlClient SQL Data Provider Security Feature Bypass Vulnerability
CVE-2024-38229 — High (CVSS 8.1): .NET and Visual Studio Remote Code Execution Vulnerability
CVE-2024-35264 — High (CVSS 8.1): .NET and Visual Studio Remote Code Execution Vulnerability

All CVEs affecting Microsoft .net →

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 →