Vulnerability Name:

CVE-2021-24099 (CCN-195617)

Assigned:2021-02-09
Published:2021-02-09
Updated:2021-03-04
Summary:Skype for Business and Lync Denial of Service Vulnerability
CVSS v3 Severity:6.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
5.7 Medium (Temporal CVSS v3.1 Vector: 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)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
6.5 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
5.7 Medium (CCN Temporal CVSS v3.1 Vector: 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)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:4.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
6.8 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-noinfo
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-24099

Source: XF
Type: UNKNOWN
ms-skype-cve202124099-dos(195617)

Source: CCN
Type: Microsoft Security TechCenter - February 2021
Skype for Business and Lync Denial of Service Vulnerability

Source: N/A
Type: Patch, Vendor Advisory
N/A

Vulnerable Configuration:Configuration 1:
  • cpe:/a:microsoft:lync_server:2013:*:*:*:*:*:*:*
  • OR cpe:/a:microsoft:skype_for_business_server:2015:cu8:*:*:*:*:*:*
  • OR cpe:/a:microsoft:skype_for_business_server:2019:cu2:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:microsoft:lync_basic:2013:sp1:*:*:*:*:x32:*
  • OR cpe:/a:microsoft:lync:2013:sp1:~~~~x64~:*:*:*:*:*
  • OR cpe:/a:microsoft:lync_basic:2013:sp1:~~~~x64~:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    microsoft lync server 2013
    microsoft skype for business server 2015 cu8
    microsoft skype for business server 2019 cu2
    microsoft lync basic 2013 sp1
    microsoft lync 2013 sp1
    microsoft lync basic 2013 sp1