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 (CVE-2026-55005) involves a heap-based buffer overflow in Microsoft Exchange Server 2016 Cumulative Update 23. An attacker with authorized access can exploit this flaw to execute arbitrary code remotely. The vulnerability is classified under CWE-122 and has a CVSS 3.1 base score of 8.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has released an official fix to address this issue as detailed in their security advisory.
Potential Impact
Successful exploitation allows an authorized attacker to execute arbitrary code remotely on the affected Exchange Server, potentially leading to full compromise of the system, including confidentiality, integrity, and availability impacts. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
An official fix is available from Microsoft. It is strongly recommended to 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 (CVE-2026-55005) involves a heap-based buffer overflow in Microsoft Exchange Server 2016 Cumulative Update 23. An attacker with authorized access can exploit this flaw to execute arbitrary code remotely. The vulnerability is classified under CWE-122 and has a CVSS 3.1 base score of 8.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has released an official fix to address this issue as detailed in their security advisory.
Potential Impact
Successful exploitation allows an authorized attacker to execute arbitrary code remotely on the affected Exchange Server, potentially leading to full compromise of the system, including confidentiality, integrity, and availability impacts. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
An official fix is available from Microsoft. It is strongly recommended to 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: 07/14/2026, 17:49:20 UTC
Last updated: 07/14/2026, 20:03:47 UTC
Views: 3
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