CISA KEV · Known exploitedMedium

CVE-2023-41763

Microsoft Skype for Business

CVE-2023-41763 affects Microsoft Skype for Business. Review the CVSS score, exploitation signals, affected versions, remediation status, and linked source material before making a change.

CVSS
5.3
EPSS
90.4%
99.8% percentile
CISA KEV
Listed
Published
2023.10.11
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability90.4%
Technical severityCVSS 5.3

Vulnerability overview

CVE-2023-41763 affects Microsoft Skype for Business. Review the CVSS score, exploitation signals, affected versions, remediation status, and linked source material before making a change.

Affected product and versions

Product
Microsoft Skype for Business
Affected versions
9319.0, 2046.0, 2015, 2019
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Due date: 2023.10.31
  1. 1
    Identify

    Confirm that Microsoft Skype for Business and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
CWE-918
KEV added
2023.10.10
Ransomware use
미확인