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TI-2026-44968 Aliases CVE-2026-62912GHSA-97wg-gxw5-r3h4

Microsoft Exchange Server Denial of Service Vulnerability

Priority LOW 33CWE-502Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Microsoft. Impact type from Microsoft.

Summary

Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to deny service over a network.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01976 80th percentileScored 2026-11-07
Fix Fixed Microsoft: 4 updates

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 2315.01.0.0 to before 15.01.2507.07215.01.2507.072Patch availableCNA
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 1415.02.0.0 to before 15.02.1544.04415.02.1544.044Patch availableCNA
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 1515.02.0.0 to before 15.02.1748.04915.02.1748.049Patch availableCNA
MicrosoftMicrosoft Exchange Server Subscription Edition RTM15.02.0.0 to before 15.02.2562.04615.02.2562.046Patch availableCNA
  • Microsoft Exchange Server 2016 Cumulative Update 23 VendorMicrosoft Affected 15.01.0.0 to before 15.01.2507.072 Fixed in 15.01.2507.072 Patch available CNA
  • Microsoft Exchange Server 2019 Cumulative Update 14 VendorMicrosoft Affected 15.02.0.0 to before 15.02.1544.044 Fixed in 15.02.1544.044 Patch available CNA
  • Microsoft Exchange Server 2019 Cumulative Update 15 VendorMicrosoft Affected 15.02.0.0 to before 15.02.1748.049 Fixed in 15.02.1748.049 Patch available CNA
  • Microsoft Exchange Server Subscription Edition RTM VendorMicrosoft Affected 15.02.0.0 to before 15.02.2562.046 Fixed in 15.02.2562.046 Patch available CNA

CPE configurations NVD · 38

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:exchange_server:2016:-:*:*:*:*:*:*2016VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_1:*:*:*:*:*:*2016 cumulative_update_1VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_10:*:*:*:*:*:*2016 cumulative_update_10VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_11:*:*:*:*:*:*2016 cumulative_update_11VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_12:*:*:*:*:*:*2016 cumulative_update_12VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_13:*:*:*:*:*:*2016 cumulative_update_13VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_14:*:*:*:*:*:*2016 cumulative_update_14VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_15:*:*:*:*:*:*2016 cumulative_update_15VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_16:*:*:*:*:*:*2016 cumulative_update_16VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_17:*:*:*:*:*:*2016 cumulative_update_17VulnerableMicrosoft
  • cpe:2.3:a:microsoft:exchange_server:2016:-:*:*:*:*:*:* Versions 2016 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_1:*:*:*:*:*:* Versions 2016 cumulative_update_1 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_10:*:*:*:*:*:* Versions 2016 cumulative_update_10 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_11:*:*:*:*:*:* Versions 2016 cumulative_update_11 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_12:*:*:*:*:*:* Versions 2016 cumulative_update_12 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_13:*:*:*:*:*:* Versions 2016 cumulative_update_13 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_14:*:*:*:*:*:* Versions 2016 cumulative_update_14 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_15:*:*:*:*:*:* Versions 2016 cumulative_update_15 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
Show 28 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_18:*:*:*:*:*:*2016 cumulative_update_18VulnerableMicrosoft
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_2:*:*:*:*:*:*2016 cumulative_update_2VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_20:*:*:*:*:*:*2016 cumulative_update_20VulnerableMicrosoft
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:2016:cumulative_update_3:*:*:*:*:*:*2016 cumulative_update_3VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_4:*:*:*:*:*:*2016 cumulative_update_4VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_5:*:*:*:*:*:*2016 cumulative_update_5VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_6:*:*:*:*:*:*2016 cumulative_update_6VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_7:*:*:*:*:*:*2016 cumulative_update_7VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_8:*:*:*:*:*:*2016 cumulative_update_8VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_9:*:*:*:*:*:*2016 cumulative_update_9VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2019:-:*:*:*:*:*:*2019VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_1:*:*:*:*:*:*2019 cumulative_update_1VulnerableMicrosoft
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:2019:cumulative_update_12:*:*:*:*:*:*2019 cumulative_update_12VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_13:*:*:*:*:*:*2019 cumulative_update_13VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_2:*:*:*:*:*:*2019 cumulative_update_2VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_3:*:*:*:*:*:*2019 cumulative_update_3VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_4:*:*:*:*:*:*2019 cumulative_update_4VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_5:*:*:*:*:*:*2019 cumulative_update_5VulnerableMicrosoft
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: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_subscription_edition:*:*:*:*:*:*:*:*before 15.02.2562.046VulnerableMicrosoft
  • 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:2016:cumulative_update_19:*:*:*:*:*:* Versions 2016 cumulative_update_19 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_2:*:*:*:*:*:* Versions 2016 cumulative_update_2 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: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:2016:cumulative_update_3:*:*:*:*:*:* Versions 2016 cumulative_update_3 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_4:*:*:*:*:*:* Versions 2016 cumulative_update_4 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_5:*:*:*:*:*:* Versions 2016 cumulative_update_5 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_6:*:*:*:*:*:* Versions 2016 cumulative_update_6 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_7:*:*:*:*:*:* Versions 2016 cumulative_update_7 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_8:*:*:*:*:*:* Versions 2016 cumulative_update_8 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_9:*:*:*:*:*:* Versions 2016 cumulative_update_9 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2019:-:*:*:*:*:*:* Versions 2019 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_1:*:*:*:*:*:* Versions 2019 cumulative_update_1 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
  • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_12:*:*:*:*:*:* Versions 2019 cumulative_update_12 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_13:*:*:*:*:*:* Versions 2019 cumulative_update_13 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_2:*:*:*:*:*:* Versions 2019 cumulative_update_2 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_3:*:*:*:*:*:* Versions 2019 cumulative_update_3 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_4:*:*:*:*:*:* Versions 2019 cumulative_update_4 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
  • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_7:*:*:*:*:*:* Versions 2019 cumulative_update_7 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
  • cpe:2.3:a:microsoft:exchange_server_subscription_edition:*:*:*:*:*:*:*:* Versions before 15.02.2562.046 Vulnerable ·Microsoft

Remediation

Microsoft 4 updates

  • KB5121576
    Security Update
    • Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.072
  • KB5121575
    Security Update
    • Microsoft Exchange Server 2019 Cumulative Update 14 15.02.1544.044
  • KB5121574
    Security Update
    • Microsoft Exchange Server 2019 Cumulative Update 15 15.02.1748.049
Show 1 more Microsoft updates
  • KB5121573
    Security Update
    • Microsoft Exchange Server Subscription Edition RTM 15.02.2562.046

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Denial of Service
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-62912
  2. 2026-10-03 Alias added: GHSA-97wg-gxw5-r3h4

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