CVE-2021-24073
Skype for Business and Lync Spoofing Vulnerability
6.5 Medium
Skype for Business and Lync Spoofing Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- Low
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- Low
- Availability
- None
Exploit likelihood
1.80%Down 2.8 points since Apr 14, 2021
What each source reports
CVE List Score used
Skype for Business and Lync Spoofing Vulnerability
Skype for Business and Lync Spoofing Vulnerability
- Record
CVE-2021-24073- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N/E:P/RL:O/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-10989
Skype for Business and Lync Spoofing Vulnerability
- Record
EUVD-2021-10989- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N/E:P/RL:O/RC:C - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-6w2g-frp4-gwrv
Skype for Business and Lync Spoofing Vulnerability
Skype for Business and Lync Spoofing Vulnerability
- Record
GHSA-6w2g-frp4-gwrv- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N - Updated
- 2026-11-02
NVD
Skype for Business and Lync Spoofing Vulnerability
- Record
CVE-2021-24073- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N - CVSS 3.1
- 7.1 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N - CVSS 2.0
- 5.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:N - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-24073 is a medium vulnerability (CVSS 6.5) in Microsoft Lync Server, published February 25, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.80%, the 78th percentile. No source names a fixed version.