Is CVE-2017-11770 in the CISA KEV catalog?

No. CVE-2017-11770 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-11770?

CVE-2017-11770 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2017-11770?

CVE-2017-11770 has an EPSS score of 5.42% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2017-11770?

No published fix for CVE-2017-11770 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2017-11770

HIGHEPSS 92th pctl

7.5

CVSS v3

NVD

Description

.NET Core 1.0, 1.1, and 2.0 allow an unauthenticated attacker to remotely cause a denial of service attack against a .NET Core web application by improperly parsing certificate data. A denial of service vulnerability exists when .NET Core improperly handles parsing certificate data, aka ".NET CORE Denial Of Service Vulnerability".

CWE-295Improper Certificate Validation

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

5.42%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Patch1

portal.msrc.microsoft.com

Third-Party Advisory3

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.