Vulnerability identifier: #VU50487
Vulnerability risk: Medium
CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-20
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Skype for Business Server
Server applications /
Conferencing, Collaboration and VoIP solutions
Microsoft Lync
Client/Desktop applications /
Messaging software
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 in Skype for Business and Lync. A remote authenticated attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
Skype for Business Server: 2015 CU8
Microsoft Lync:
External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24099
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.