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TI-2020-13064 Aliases CVE-2020-17085GHSA-mj56-6jxg-8vw7

Microsoft Exchange Server Denial of Service Vulnerability

Priority LOW 36Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
High · High · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

Microsoft Exchange Server Denial of Service Vulnerability

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.03633 89th percentileScored 2026-11-07
Fix Fixed Microsoft Exchange Server 2019 Cumulative Update 6 (Microsoft): publicationMicrosoft Exchange Server 2016 Cumulative Update 17 (Microsoft): publication+3 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 615.02.0 to before publicationpublicationPatch availableCNA
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 1715.01.0 to before publicationpublicationPatch availableCNA
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 715.02.0 to before publicationpublicationPatch availableCNA
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 1815.01.0 to before publicationpublicationPatch availableCNA
MicrosoftMicrosoft Exchange Server 2013 Cumulative Update 2315.00.0 to before publicationpublicationPatch availableCNA
  • 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 17 VendorMicrosoft Affected 15.01.0 to before publication Fixed in publication Patch available CNA
  • Microsoft Exchange Server 2019 Cumulative Update 7 VendorMicrosoft Affected 15.02.0 to before publication Fixed in publication Patch available CNA
  • Microsoft Exchange Server 2016 Cumulative Update 18 VendorMicrosoft Affected 15.01.0 to before publication Fixed in publication Patch available CNA
  • Microsoft Exchange Server 2013 Cumulative Update 23 VendorMicrosoft Affected 15.00.0 to before publication Fixed in publication Patch available CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*2013 cumulative_update_23VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_17:*:*:*:*:*:*2016 cumulative_update_17VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_18:*:*:*:*:*:*2016 cumulative_update_18VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_6:*:*:*:*:*:*2019 cumulative_update_6VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_7:*:*:*:*:*:*2019 cumulative_update_7VulnerableMicrosoft
  • cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:* Versions 2013 cumulative_update_23 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:2016:cumulative_update_18:*:*:*:*:*:* Versions 2016 cumulative_update_18 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_6:*:*:*:*:*:* Versions 2019 cumulative_update_6 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_7:*:*:*:*:*:* Versions 2019 cumulative_update_7 Vulnerable ·Microsoft

Remediation

  • Fix · CNA Microsoft Exchange Server 2019 Cumulative Update 6 (Microsoft) Fixed in publication
  • Fix · CNA Microsoft Exchange Server 2016 Cumulative Update 17 (Microsoft) Fixed in publication
  • Fix · CNA Microsoft Exchange Server 2019 Cumulative Update 7 (Microsoft) Fixed in publication
  • Fix · CNA Microsoft Exchange Server 2016 Cumulative Update 18 (Microsoft) Fixed in publication
  • Fix · CNA Microsoft Exchange Server 2013 Cumulative Update 23 (Microsoft) Fixed in publication

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-17085
  2. 2026-10-03 Alias added: GHSA-mj56-6jxg-8vw7

References

Patch 1

  • 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
See all 258 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences