#VU53103 Spoofing attack in Microsoft Lync and Skype for Business Server - CVE-2021-26421
Published: May 11, 2021
Vulnerability identifier: #VU53103
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-26421
CWE-ID: CWE-451
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Microsoft Lync
Skype for Business Server
Microsoft Lync
Skype for Business Server
Software vendor:
Microsoft
Microsoft
Description
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to incorrect processing of user-supplied data in Skype for Business and Lync. A remote authenticated attacker can spoof page content.
Remediation
Install updates from vendor's website.