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Known exploited vulnerability

CVE-2023-41763

mediumCVSS 3.1 5.3In CISA KEVEPSS 90%Published · Microsoft

The short answer

CVE-2023-41763 affects Microsoft Skype for Business Server 2015 CU13 and is rated medium (CVSS 5.3). CISA added it to the Known Exploited Vulnerabilities catalog on 2023-10-10: attackers are using it, so patch it first. The vendor has linked a patch.

What it is

Skype for Business Elevation of Privilege Vulnerability

Weakness: CWE-918.

Severity

5.3 medium

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

Exploited (CISA KEV)

Yes, since Oct 10, 2023

Federal due date Oct 31, 2023

EPSS, next 30 days

90%

Higher than 100% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

What CISA says to do

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

Affected products

Skype for Business Server 2015 CU13, Skype for Business Server 2019 CU7. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2023-41763 being exploited?

Yes. CISA added CVE-2023-41763 to its Known Exploited Vulnerabilities catalog on 2023-10-10, with a federal remediation due date of 2023-10-31.

How do I fix CVE-2023-41763?

CISA's required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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