How severe is CVE-2018-8546?

CVE-2018-8546 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-8546 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-2018-8546?

CVE-2018-8546 primarily affects Microsoft Lync. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-8546?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-8546 published?

CVE-2018-8546 was published on 2018-11-14 and last updated on 2026-06-17.

CVE-2018-8546

CVE-2018-8546 is a medium-severity vulnerability in Microsoft Lync with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 5% (92nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Lync
Published: 2018-11-14
Last modified: 2026-06-17

Description

A denial of service vulnerability exists in Skype for Business, aka "Microsoft Skype for Business Denial of Service Vulnerability." This affects Office 365 ProPlus, Microsoft Office, Microsoft Lync, Skype.

Frequently asked questions

What is CVE-2018-8546?: A denial of service vulnerability exists in Skype for Business, aka "Microsoft Skype for Business Denial of Service Vulnerability." This affects Office 365 ProPlus, Microsoft Office, Microsoft Lync, Skype.
How severe is CVE-2018-8546?: CVE-2018-8546 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-8546 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-2018-8546?: CVE-2018-8546 primarily affects Microsoft Lync. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-8546?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-8546 published?: CVE-2018-8546 was published on 2018-11-14 and last updated on 2026-06-17.

References

Affected products (6)

cpe:2.3:a:microsoft:lync:2013:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:lync_basic:2013:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:office_365_proplus:-:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:skype_for_business:2016:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:skype_for_business_basic:2016:*:*:*:*:*:*:*

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