Important CVSS 5.9 EPSS 0.05281 2019-06 archive

Executive Summary

A denial of service vulnerability exists in Skype for Business. An attacker who successfully exploited the vulnerability could cause Skype for Business to stop responding. Note that the denial of service would not allow an attacker to execute code or to elevate the attacker's user rights. To exploit the vulnerability, an attacker needs to obtain a dial-in link for a vulnerable server and then initiates a series of calls within a short amount of time. The update addresses the vulnerability by correcting the way that Skype for Business server handles objects in memory.

Overview

5.9
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Denial of Service
Released Jun 11 2019
Last Updated Jun 11 2019
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.05281 — 0.91713 percentile
NVD CVSS 5.9 MEDIUM — differs from MSRC

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
ATTACK VECTOR
Network
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged

EPSS Score

0.05281
probability of exploitation in the next 30 days
0.91713 percentile - updated 2026-07-25
View on FIRST.org

Affected Products

2 affected products
Product KB Article Severity Impact Restart Required
Microsoft Lync Server 2010 4506009 (Security Update) Important Denial of Service Maybe
Microsoft Lync Server 2013 4506009 (Security Update) Important Denial of Service Maybe

Patches

1 patch
Article Type Restart
4506009 Security Update Maybe

Known Exploits

Acknowledgments

None