Is CVE-2017-11786 in the CISA KEV catalog?

No. CVE-2017-11786 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-11786?

CVE-2017-11786 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2017-11786?

CVE-2017-11786 has an EPSS score of 9.39% (95th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2017-11786?

No published fix for CVE-2017-11786 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2017-11786

HIGHEPSS 95th pctl

8.8

CVSS v3

NVD

Description

Skype for Business in Microsoft Lync 2013 SP1 and Skype for Business 2016 allows an attacker to steal an authentication hash that can be reused elsewhere, due to how Skype for Business handles authentication requests, aka "Skype for Business Elevation of Privilege Vulnerability."

CWE-294

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 InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

9.39%probability of exploitation in 30 days

95thpercentile

High risk: more likely to be exploited than 95% of all known CVEs.

References

Patch1

portal.msrc.microsoft.com

Third-Party Advisory2

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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.