How severe is CVE-2019-1301?

CVE-2019-1301 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-2019-1301 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-1301?

CVE-2019-1301 primarily affects Microsoft .net Core. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-1301?

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-2019-1301 published?

CVE-2019-1301 was published on 2019-09-11 and last updated on 2026-06-17.

CVE-2019-1301

CVE-2019-1301 is a high-severity vulnerability in Microsoft .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.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 5% (92nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft .net Core
Published: 2019-09-11
Last modified: 2026-06-17

Description

A denial of service vulnerability exists when .NET Core improperly handles web requests, aka '.NET Core Denial of Service Vulnerability'.

Frequently asked questions

What is CVE-2019-1301?: A denial of service vulnerability exists when .NET Core improperly handles web requests, aka '.NET Core Denial of Service Vulnerability'.
How severe is CVE-2019-1301?: CVE-2019-1301 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-2019-1301 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-1301?: CVE-2019-1301 primarily affects Microsoft .net Core. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-1301?: 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-2019-1301 published?: CVE-2019-1301 was published on 2019-09-11 and last updated on 2026-06-17.

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1301

Affected products (4)

cpe:2.3:a:microsoft:.net_core:2.1:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net_core:2.2:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:powershell_core:6.1:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:powershell_core:6.2:*:*:*:*:*:*:*

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