Denial of serviservice in Skype for Business

Published: 2018-11-13
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2018-8546
Exploitation vector Network
Public exploit N/A
Vulnerable software
Skype for Business
Client/Desktop applications / Messaging software

Microsoft Lync
Client/Desktop applications / Messaging software

Microsoft Office
Client/Desktop applications / Office applications

Vendor Microsoft

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Input validation error

EUVDB-ID: #VU15848

Risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-8546

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input when processing a certain number of emojis. A remote attacker can send a very long message consisting of emojis and crash the affected application.


Install updates from vendor's website.

Vulnerable software versions

Skype for Business: 2016

Microsoft Lync: 2013

Microsoft Office: 365 ProPlus - 2019

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.