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TI-2021-18174 Aliases CVE-2021-41350GHSA-ch48-4rv9-gv6m

Microsoft Exchange Server Spoofing Vulnerability

Priority LOW 33Published · Updated

Key facts

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

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

Summary

Microsoft Exchange Server Spoofing Vulnerability

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01908 79th percentileScored 2026-11-07
Fix Fixed Microsoft Exchange Server 2016 Cumulative Update 21 (Microsoft): 15.01.2308.015Microsoft Exchange Server 2019 Cumulative Update 10 (Microsoft): 15.02.0922.014+2 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

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 2016 Cumulative Update 2115.01.0 to before 15.01.2308.01515.01.2308.015Patch availableCNA
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 1015.02.0 to before 15.02.0922.01415.02.0922.014Patch availableCNA
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 1115.02.0 to before 15.02.0986.00915.02.0986.009Patch availableCNA
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 2215.0.0 to before 15.01.2375.01215.01.2375.012Patch availableCNA
  • Microsoft Exchange Server 2016 Cumulative Update 21 VendorMicrosoft Affected 15.01.0 to before 15.01.2308.015 Fixed in 15.01.2308.015 Patch available CNA
  • Microsoft Exchange Server 2019 Cumulative Update 10 VendorMicrosoft Affected 15.02.0 to before 15.02.0922.014 Fixed in 15.02.0922.014 Patch available CNA
  • Microsoft Exchange Server 2019 Cumulative Update 11 VendorMicrosoft Affected 15.02.0 to before 15.02.0986.009 Fixed in 15.02.0986.009 Patch available CNA
  • Microsoft Exchange Server 2016 Cumulative Update 22 VendorMicrosoft Affected 15.0.0 to before 15.01.2375.012 Fixed in 15.01.2375.012 Patch available CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_21:*:*:*:*:*:*2016 cumulative_update_21VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_22:*:*:*:*:*:*2016 cumulative_update_22VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_10:*:*:*:*:*:*2019 cumulative_update_10VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_11:*:*:*:*:*:*2019 cumulative_update_11VulnerableMicrosoft
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_21:*:*:*:*:*:* Versions 2016 cumulative_update_21 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_22:*:*:*:*:*:* Versions 2016 cumulative_update_22 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_10:*:*:*:*:*:* Versions 2019 cumulative_update_10 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_11:*:*:*:*:*:* Versions 2019 cumulative_update_11 Vulnerable ·Microsoft

Remediation

  • Fix · CNA Microsoft Exchange Server 2016 Cumulative Update 21 (Microsoft) Fixed in 15.01.2308.015
  • Fix · CNA Microsoft Exchange Server 2019 Cumulative Update 10 (Microsoft) Fixed in 15.02.0922.014
  • Fix · CNA Microsoft Exchange Server 2019 Cumulative Update 11 (Microsoft) Fixed in 15.02.0986.009
  • Fix · CNA Microsoft Exchange Server 2016 Cumulative Update 22 (Microsoft) Fixed in 15.01.2375.012

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-41350
  2. 2026-10-03 Alias added: GHSA-ch48-4rv9-gv6m

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