CVE-2026-54990: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 11 Version 24H2
Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-54990) involves a heap-based buffer overflow in the Remote Desktop Client on Windows 11 Version 24H2 (build 10.0.26100.0). An attacker can exploit this flaw remotely to execute arbitrary code with high impact on confidentiality, integrity, and availability. The CVSS v3.1 base score is 9.8, indicating critical severity. Microsoft has published an official security update to remediate the issue.
Potential Impact
Successful exploitation allows remote, unauthenticated attackers to execute arbitrary code on affected systems, potentially leading to full system compromise, data loss, or service disruption. The vulnerability affects confidentiality, integrity, and availability at a high level.
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-2026-54990 as soon as possible to remediate this vulnerability.
CVE-2026-54990: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 11 Version 24H2
Description
Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
CVSS v3.1
Score 9.8critical
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-54990) involves a heap-based buffer overflow in the Remote Desktop Client on Windows 11 Version 24H2 (build 10.0.26100.0). An attacker can exploit this flaw remotely to execute arbitrary code with high impact on confidentiality, integrity, and availability. The CVSS v3.1 base score is 9.8, indicating critical severity. Microsoft has published an official security update to remediate the issue.
Potential Impact
Successful exploitation allows remote, unauthenticated attackers to execute arbitrary code on affected systems, potentially leading to full system compromise, data loss, or service disruption. The vulnerability affects confidentiality, integrity, and availability at a high level.
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-2026-54990 as soon as possible to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-16T14:10:05.868Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54990","vendor":"Microsoft"}]
Threat ID: 6a566f7e68715ace43e6bc16
Added to database: 07/14/2026, 17:18:54 UTC
Last enriched: 07/15/2026, 01:02:34 UTC
Last updated: 07/15/2026, 04:18:39 UTC
Views: 8
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.