Vulnerability identifier: #VU15848

Vulnerability 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

Exploitation vector: Network

Exploit availability: No

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

Description

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Skype for Business: 2016

Microsoft Lync:

Microsoft Office: 2019, 365 ProPlus

---

External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8546

---

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.