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.

Published: 2018-11-14 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-8546 is rated Moderate Risk (52.8/100): CVSS Medium severity, with high exploitation likelihood (EPSS 13.48%, 94th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2018-8546

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-31 17.27% 13.48% -3.79%
2 2026-05-02 17.68% 17.27% -0.41%
3 2026-04-04 — 17.68% —

Full EPSS history (26 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-8546

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.9 3.0 MEDIUM
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.2 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2018-8546

Affected software / configurations for CVE-2018-8546

Vendor Product Version Raw CPE
microsoft lync 2013 cpe:2.3:a:microsoft:lync:2013:sp1:*:*:*:*:*:*
microsoft lync_basic 2013 cpe:2.3:a:microsoft:lync_basic:2013:sp1:*:*:*:*:*:*
microsoft office 2019 cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:*:*
microsoft office_365_proplus — cpe:2.3:a:microsoft:office_365_proplus:-:*:*:*:*:*:*:*
microsoft skype_for_business 2016 cpe:2.3:a:microsoft:skype_for_business:2016:*:*:*:*:*:*:*
microsoft skype_for_business_basic 2016 cpe:2.3:a:microsoft:skype_for_business_basic:2016:*:*:*:*:*:*:*

References for CVE-2018-8546

cvelogic Threat Intelligence