Microsoft Exchange Server Remote Code Execution Vulnerability
Priority HIGH 66CWE-269Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Privilege escalation
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-269.
Summary
<p>A remote code execution vulnerability exists in Microsoft Exchange server due to improper validation of cmdlet arguments.</p> <p>An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the System user. Exploitation of the vulnerability requires an authenticated user in a certain Exchange role to be compromised.</p> <p>The security update addresses the vulnerability by correcting how Microsoft Exchange handles cmdlet arguments.</p>
Why it matters now
EPSS 0.46497 98th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Microsoft Exchange Server 2019 Cumulative Update 5 (Microsoft): publicationMicrosoft Exchange Server 2019 Cumulative Update 6 (Microsoft): publication+2 more products
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 5 | 15.02.0 to before publication | publication | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 6 | 15.02.0 to before publication | publication | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 16 | 15.01.0 to before publication | publication | Patch available | CNA |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 17 | 15.01.0 to before publication | publication | Patch available | CNA |
- Microsoft Exchange Server 2019 Cumulative Update 5 VendorMicrosoft Affected 15.02.0 to before publication Fixed in publication Patch available CNA
- Microsoft Exchange Server 2019 Cumulative Update 6 VendorMicrosoft Affected 15.02.0 to before publication Fixed in publication Patch available CNA
- Microsoft Exchange Server 2016 Cumulative Update 16 VendorMicrosoft Affected 15.01.0 to before publication Fixed in publication Patch available CNA
- Microsoft Exchange Server 2016 Cumulative Update 17 VendorMicrosoft Affected 15.01.0 to before publication Fixed in publication Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_16:*:*:*:*:*:* | 2016 cumulative_update_16 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_17:*:*:*:*:*:* | 2016 cumulative_update_17 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_5:*:*:*:*:*:* | 2019 cumulative_update_5 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_6:*:*:*:*:*:* | 2019 cumulative_update_6 | Vulnerable | Microsoft |
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_16:*:*:*:*:*:* Versions 2016 cumulative_update_16 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_17:*:*:*:*:*:* Versions 2016 cumulative_update_17 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_5:*:*:*:*:*:* Versions 2019 cumulative_update_5 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_6:*:*:*:*:*:* Versions 2019 cumulative_update_6 Vulnerable ·Microsoft
Remediation
- Fix · CNA Microsoft Exchange Server 2019 Cumulative Update 5 (Microsoft) Fixed in publication
- Fix · CNA Microsoft Exchange Server 2019 Cumulative Update 6 (Microsoft) Fixed in publication
- Fix · CNA Microsoft Exchange Server 2016 Cumulative Update 16 (Microsoft) Fixed in publication
- Fix · CNA Microsoft Exchange Server 2016 Cumulative Update 17 (Microsoft) Fixed in publication
Timeline
- 2026-10-02 Threatist record created from CVE-2020-16875
- 2026-10-03 Alias added: GHSA-5rg4-jqjp-6664
References
More Microsoft Exchange Server vulnerabilities
- TI-2024-14170 Microsoft Exchange Server Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2022-19610 Microsoft Exchange Server Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2021-13547 Microsoft Exchange Server Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2021-13502 Microsoft Exchange Server Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2021-08465 Microsoft Exchange Server Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2023-07929 Microsoft Exchange Server Remote Code Execution Vulnerability KEVCVSS 3.1HIGH 8.8
Sources
- CVE-2020-16875 · CVE Program
- CVE-2020-16875 · NVD
- FIRST EPSS
- GHSA-5rg4-jqjp-6664 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences