CVE-2026-42993: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 21H2
Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
AI Analysis
Technical Summary
CVE-2026-42993 is a heap-based buffer overflow vulnerability in the Remote Desktop Client of Microsoft Windows 10 Version 21H2 (build 10.0.19044.0). This vulnerability allows remote attackers to execute arbitrary code on affected systems without privileges, requiring user interaction. The vulnerability has a high attack complexity and impacts confidentiality, integrity, and availability. Microsoft has released an official fix to remediate this issue.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code remotely, potentially leading to full system compromise including unauthorized access, data modification, and denial of service. The vulnerability affects confidentiality, integrity, and availability of the affected system.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42993 to remediate this vulnerability.
CVE-2026-42993: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 21H2
Description
Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
CVSS v3.1
Score 7.5high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-42993 is a heap-based buffer overflow vulnerability in the Remote Desktop Client of Microsoft Windows 10 Version 21H2 (build 10.0.19044.0). This vulnerability allows remote attackers to execute arbitrary code on affected systems without privileges, requiring user interaction. The vulnerability has a high attack complexity and impacts confidentiality, integrity, and availability. Microsoft has released an official fix to remediate this issue.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code remotely, potentially leading to full system compromise including unauthorized access, data modification, and denial of service. The vulnerability affects confidentiality, integrity, and availability of the affected system.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42993 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-30T23:43:50.746Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42993","vendor":"Microsoft"}]
Threat ID: 6a284ccb8dd33fbd85664966
Added to database: 06/09/2026, 17:26:35 UTC
Last enriched: 07/29/2026, 21:51:03 UTC
Last updated: 07/31/2026, 21:26:44 UTC
Views: 80
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