Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 affected
Version Status Constraints
15.01.0.0 affected < 15.01.2507.071
Microsoft Microsoft Exchange Server 2019 Cumulative Update 14 affected
Version Status Constraints
15.02.0.0 affected < 15.02.1544.043
Microsoft Microsoft Exchange Server 2019 Cumulative Update 15 affected
Version Status Constraints
15.02.0.0 affected < 15.02.1748.048
Microsoft Microsoft Exchange Server Subscription Edition RTM affected
Version Status Constraints
15.02.0.0 affected < 15.02.2562.045

No data.

No data.

No data.

Project Subscriptions

Vendors Products
Microsoft Subscribe
Exchange Server 2016 Subscribe
Exchange Server 2019 Subscribe
Exchange Server Se Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55005 cve-icon
History

Tue, 14 Jul 2026 17:15:00 +0000

Type Values Removed Values Added
Description Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.
Title Microsoft Exchange Server Remote Code Execution Vulnerability
First Time appeared Microsoft
Microsoft exchange Server 2016
Microsoft exchange Server 2019
Microsoft exchange Server Se
Weaknesses CWE-122
CPEs cpe:2.3:a:microsoft:exchange_server_2016:*:cumulative_update_23:*:*:*:*:*:*
cpe:2.3:a:microsoft:exchange_server_2019:*:cumulative_update_14:*:*:*:*:*:*
cpe:2.3:a:microsoft:exchange_server_2019:*:cumulative_update_15:*:*:*:*:*:*
cpe:2.3:a:microsoft:exchange_server_se:*:RTM:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft exchange Server 2016
Microsoft exchange Server 2019
Microsoft exchange Server Se
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-07-14T18:45:30.692Z

Reserved: 2026-06-16T14:10:05.869Z

Link: CVE-2026-55005

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses