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Vulnerability record · CVE-2019-0657 · published 5 March 2019

CVE-2019-0657: Microsoft .net core improper input validation vulnerability

Microsoft · .Net Core

A vulnerability exists in certain .Net Framework API's and Visual Studio in the way they parse URL's, aka '.NET Framework and Visual Studio Spoofing Vulnerability'.

5.9 CVSS 3.0 Medium EPSS 4.5% · top 8.8% CWE-20 · Improper input validation
5.9CVSS 3.0 base score, v2 4.3
4.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

A vulnerability exists in certain .Net Framework API's and Visual Studio in the way they parse URL's, aka '.NET Framework and Visual Studio Spoofing Vulnerability'.

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/106890 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:0349 Third Party Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0657 PatchVendor Advisory
http://www.securityfocus.com/bid/106890 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:0349 Third Party Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0657 PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-0657), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.