CVE-2026-32157
Published: 14 April 2026
Summary
CVE-2026-32157 is a high-severity Use After Free (CWE-416) vulnerability in Microsoft Windows 10 21H2. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Client Execution (T1203); ranked at the 32.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-16 (Memory Protection) and SI-2 (Flaw Remediation).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Requires timely remediation of flaws, directly addressing the use-after-free vulnerability in Remote Desktop Client through patching as advised by MSRC.
Implements memory protection mechanisms like ASLR and DEP to prevent successful exploitation of use-after-free vulnerabilities leading to remote code execution.
Deploys malicious code protection tools to scan for and block exploit payloads or anomalous behavior from RCE triggered by the crafted RDP file.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Use-after-free vulnerability in Remote Desktop Client enables remote code execution by tricking users into opening crafted RDP files or connecting to malicious RDP servers, directly facilitating T1203: Exploitation for Client Execution.
NVD Description
Use after free in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
Deeper analysisAI
CVE-2026-32157 is a use-after-free vulnerability (CWE-416) affecting the Remote Desktop Client. Published on 2026-04-14, it has a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H), indicating high severity due to its potential for significant impact.
An unauthorized attacker with network access can exploit this vulnerability by tricking a user into interacting with a malicious Remote Desktop connection, such as opening a crafted RDP file. Successful exploitation allows remote code execution on the target system, compromising confidentiality, integrity, and availability with high impact.
The Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32157 provides details on patches and mitigation guidance for affected Remote Desktop Client versions.
Details
- CWE(s)