CVE-2026-55005: CWE-122: Heap-based Buffer Overflow in Microsoft Microsoft Exchange Server 2016 Cumulative Update 23
Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.
AI Analysis
Technical Summary
This vulnerability (CWE-122) in Microsoft Exchange Server 2016 CU23 is a heap-based buffer overflow that enables an attacker with authorized access to execute arbitrary code remotely. The CVSS 3.1 score of 8.8 reflects high impact on confidentiality, integrity, and availability. Microsoft has published an official fix to remediate this issue.
Potential Impact
Successful exploitation allows an authorized attacker to execute arbitrary code remotely, potentially leading to full compromise of the affected Exchange Server instance. The vulnerability impacts confidentiality, integrity, and availability of the system.
Mitigation Recommendations
An official fix is available from Microsoft. Administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55005 to remediate this vulnerability.
CVE-2026-55005: CWE-122: Heap-based Buffer Overflow in Microsoft Microsoft Exchange Server 2016 Cumulative Update 23
Description
Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.
CVSS v3.1
Score 8.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-122) in Microsoft Exchange Server 2016 CU23 is a heap-based buffer overflow that enables an attacker with authorized access to execute arbitrary code remotely. The CVSS 3.1 score of 8.8 reflects high impact on confidentiality, integrity, and availability. Microsoft has published an official fix to remediate this issue.
Potential Impact
Successful exploitation allows an authorized attacker to execute arbitrary code remotely, potentially leading to full compromise of the affected Exchange Server instance. The vulnerability impacts confidentiality, integrity, and availability of the system.
Mitigation Recommendations
An official fix is available from Microsoft. Administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55005 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-16T14:10:05.869Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55005","vendor":"Microsoft"}]
Threat ID: 6a566f8068715ace43e6bf5c
Added to database: 07/14/2026, 17:18:56 UTC
Last enriched: 08/13/2026, 15:27:26 UTC
Last updated: 08/25/2026, 22:52:12 UTC
Views: 158
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