How severe is CVE-2024-21386?

CVE-2024-21386 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2024-21386 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-21386?

CVE-2024-21386 primarily affects Microsoft Asp.net Core. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-21386?

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.

Does CVE-2024-21386 have an EU (EUVD) identifier?

Yes. CVE-2024-21386 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-0637.

When was CVE-2024-21386 published?

CVE-2024-21386 was published on 2024-02-13 and last updated on 2026-06-17.

CVE-2024-21386

CVE-2024-21386 is a high-severity vulnerability in Microsoft Asp.net Core with a CVSS 3.x base score of 7.5. 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-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-0637
Weakness: CWE-400
Affected product: Microsoft Asp.net Core
Published: 2024-02-13
Last modified: 2026-06-17

Description

.NET Denial of Service Vulnerability

Frequently asked questions

What is CVE-2024-21386?: .NET Denial of Service Vulnerability
How severe is CVE-2024-21386?: CVE-2024-21386 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2024-21386 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-21386?: CVE-2024-21386 primarily affects Microsoft Asp.net Core. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-21386?: 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.
Does CVE-2024-21386 have an EU (EUVD) identifier?: Yes. CVE-2024-21386 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-0637.
When was CVE-2024-21386 published?: CVE-2024-21386 was published on 2024-02-13 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21386

Affected products (2)

cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*

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