Risk | Medium |
Patch available | YES |
Number of vulnerabilities | 2 |
CVE-ID | CVE-2021-24073 CVE-2021-24099 |
CWE-ID | CWE-451 CWE-20 |
Exploitation vector | Network |
Public exploit | N/A |
Vulnerable software Subscribe |
Skype for Business Server Server applications / Conferencing, Collaboration and VoIP solutions Microsoft Lync Client/Desktop applications / Messaging software |
Vendor | Microsoft |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
EUVDB-ID: #VU50486
Risk: Low
CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-24073
CWE-ID:
CWE-451 - User Interface (UI) Misrepresentation of Critical Information (Clickjacking, spoofing)
Exploit availability: No
DescriptionThe 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.
MitigationInstall updates from vendor's website.
Vulnerable software versionsSkype for Business Server: 2015 CU8
Microsoft Lync: 2013
External linkshttp://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24073
Q & A
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.
EUVDB-ID: #VU50487
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: CVE-2021-24099
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe 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.
MitigationInstall updates from vendor's website.
Vulnerable software versionsSkype for Business Server: 2015 CU8
Microsoft Lync: 2013
External linkshttp://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24099
Q & A
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.