CVE-2021-26421 — MEDIUM (6.5)

Vulnerability Description

Skype for Business and Lync Spoofing Vulnerability

CVSS Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

HIGH

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Microsoft	Lync Server	2013
Microsoft	Skype For Business Server	2015

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-2642PatchVendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-2642PatchVendor Advisory

FAQ

What is CVE-2021-26421?

CVE-2021-26421 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Skype for Business and Lync Spoofing Vulnerability

How severe is CVE-2021-26421?

CVE-2021-26421 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2021-26421?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Lync Server, Microsoft Skype For Business Server.