Read the docs
TI-2021-11416 Aliases CVE-2021-31198GHSA-q258-48f4-r94w

Microsoft Exchange Server Remote Code Execution Vulnerability

Priority MEDIUM 44CWE-94Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-94.

Summary

Microsoft Exchange Server Remote Code Execution Vulnerability

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.04873 92nd percentileScored 2026-11-07
Fix Fixed Microsoft Exchange Server 2019 Cumulative Update 9 (Microsoft): 15.02.0858.012Microsoft Exchange Server 2016 Cumulative Update 20 (Microsoft): 15.01.2242.010+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 915.02.0 to before 15.02.0858.01215.02.0858.012Patch availableCNA
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 2015.01.0 to before 15.01.2242.01015.01.2242.010Patch availableCNA
MicrosoftMicrosoft Exchange Server 2013 Cumulative Update 2315.00.0 to before 15.00.1497.01815.00.1497.018Patch availableCNA
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 1915.01.0 to before 15.01.2176.01415.01.2176.014Patch availableCNA
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 815.02.0 to before 15.02.0792.01515.02.0792.015Patch availableCNA
  • Microsoft Exchange Server 2019 Cumulative Update 9 VendorMicrosoft Affected 15.02.0 to before 15.02.0858.012 Fixed in 15.02.0858.012 Patch available CNA
  • Microsoft Exchange Server 2016 Cumulative Update 20 VendorMicrosoft Affected 15.01.0 to before 15.01.2242.010 Fixed in 15.01.2242.010 Patch available CNA
  • Microsoft Exchange Server 2013 Cumulative Update 23 VendorMicrosoft Affected 15.00.0 to before 15.00.1497.018 Fixed in 15.00.1497.018 Patch available CNA
  • Microsoft Exchange Server 2016 Cumulative Update 19 VendorMicrosoft Affected 15.01.0 to before 15.01.2176.014 Fixed in 15.01.2176.014 Patch available CNA
  • Microsoft Exchange Server 2019 Cumulative Update 8 VendorMicrosoft Affected 15.02.0 to before 15.02.0792.015 Fixed in 15.02.0792.015 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_19:*:*:*:*:*:*2016 cumulative_update_19VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_20:*:*:*:*:*:*2016 cumulative_update_20VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:*2019 cumulative_update_8VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_9:*:*:*:*:*:*2019 cumulative_update_9VulnerableMicrosoft
  • 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_19:*:*:*:*:*:* Versions 2016 cumulative_update_19 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_20:*:*:*:*:*:* Versions 2016 cumulative_update_20 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:* Versions 2019 cumulative_update_8 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_9:*:*:*:*:*:* Versions 2019 cumulative_update_9 Vulnerable ·Microsoft

Remediation

  • Fix · CNA Microsoft Exchange Server 2019 Cumulative Update 9 (Microsoft) Fixed in 15.02.0858.012
  • Fix · CNA Microsoft Exchange Server 2016 Cumulative Update 20 (Microsoft) Fixed in 15.01.2242.010
  • Fix · CNA Microsoft Exchange Server 2013 Cumulative Update 23 (Microsoft) Fixed in 15.00.1497.018
  • Fix · CNA Microsoft Exchange Server 2016 Cumulative Update 19 (Microsoft) Fixed in 15.01.2176.014
  • Fix · CNA Microsoft Exchange Server 2019 Cumulative Update 8 (Microsoft) Fixed in 15.02.0792.015

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-31198
  2. 2026-10-03 Alias added: GHSA-q258-48f4-r94w

References

Patch 1

Advisory 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