How severe is CVE-2023-36789?

CVE-2023-36789 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-36789 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-36789?

CVE-2023-36789 primarily affects Microsoft Skype For Business Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-36789?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-36789 published?

CVE-2023-36789 was published on 2023-10-10 and last updated on 2026-06-17.

CVE-2023-36789

CVE-2023-36789 is a high-severity vulnerability in Microsoft Skype For Business Server with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: High (CVSS 3.x base score 7.2)
EPSS exploit prediction: 2% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Microsoft Skype For Business Server
Published: 2023-10-10
Last modified: 2026-06-17

Description

Skype for Business Remote Code Execution Vulnerability

Frequently asked questions

What is CVE-2023-36789?: Skype for Business Remote Code Execution Vulnerability
How severe is CVE-2023-36789?: CVE-2023-36789 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-36789 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-36789?: CVE-2023-36789 primarily affects Microsoft Skype For Business Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-36789?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-36789 published?: CVE-2023-36789 was published on 2023-10-10 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36789

Affected products (2)

cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_13:*:*:*:*:*:*
cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_7:*:*:*:*:*:*

More vulnerabilities in Microsoft Skype For Business Server

CVE-2023-36786 — High (CVSS 7.2): Skype for Business Remote Code Execution Vulnerability
CVE-2023-36780 — High (CVSS 7.2): Skype for Business Remote Code Execution Vulnerability
CVE-2021-26422 — High (CVSS 7.2): Skype for Business and Lync Remote Code Execution Vulnerability
CVE-2022-26911 — Medium (CVSS 6.5): Skype for Business Information Disclosure Vulnerability
CVE-2021-26421 — Medium (CVSS 6.5): Skype for Business and Lync Spoofing Vulnerability
CVE-2021-24099 — Medium (CVSS 6.5): Skype for Business and Lync Denial of Service Vulnerability

All CVEs affecting Microsoft Skype For Business Server →

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