Microsoft System.text.encodings.web vulnerabilities

3 CVEs affecting Microsoft System.text.encodings.web, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2017-0256, published 2017-05-12.

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Known exploited (CISA KEV) first, then by EPSS exploit probability.

• CVE-2017-0247, published 2017-05-12. High severity, CVSS 7.5. EPSS: 16.9% chance of exploitation in the next 30 days. A denial of service vulnerability exists when the ASP.NET Core fails to properly validate web requests. NOTE: Microsoft has not commented on third-party claims that the issue is that the…
• CVE-2017-0249, published 2017-05-12. High severity, CVSS 7.3. EPSS: 4.2% chance of exploitation in the next 30 days. An elevation of privilege vulnerability exists when the ASP.NET Core fails to properly sanitize web requests.
• CVE-2017-0256, published 2017-05-12. Medium severity, CVSS 5.3. EPSS: 3.5% chance of exploitation in the next 30 days. A spoofing vulnerability exists when the ASP.NET Core fails to properly sanitize web requests.