CVE-2021-24073

Name: CVE-2021-24073
Creator: NVD / NIST
Published: 2021-02-25T23:15:14.54+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.62%

Last modified Jun 17, 2026

CVE-2021-24073 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Skype for Business and Lync Spoofing Vulnerability. EPSS estimates a 1.62% chance of exploitation in the next 30 days.

Description

Skype for Business and Lync Spoofing Vulnerability

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.62%

73.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions	Update
Microsoft	Lync Server	2013	—
Microsoft	Skype For Business Server	2015	Cu8

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24073Patch, Vendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24073Patch, Vendor Advisory

Timeline

Published: Feb 25, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-24073?

Skype for Business and Lync Spoofing Vulnerability

How severe is CVE-2021-24073?

CVE-2021-24073 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.62% probability of exploitation in the next 30 days.

How do I fix CVE-2021-24073?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-24073?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST