Product:
Windows HTTP.sys
Summary
A time-of-check time-of-use race condition in Windows HTTP.sys allows an authorized attacker to elevate privileges locally. This vulnerability can lead to significant security risks if exploited. It is crucial for users to be aware of this issue and take necessary precautions.
Details
| Severity | Base Score | CVE |
|---|---|---|
| HIGH | 7.8 | CVE-2026-21240 |
Exploitation
To exploit this vulnerability, an attacker with local access can manipulate the timing of operations in the HTTP.sys component. By creating a race condition, the attacker can gain elevated privileges, potentially allowing them to execute arbitrary code or access sensitive information. This requires low privileges and does not necessitate user interaction, making it a serious concern for affected systems.
Affected Products
- Windows HTTP.sys: A core component of Windows that handles HTTP requests and responses, vulnerable to privilege escalation due to a race condition.
Mitigation
To mitigate this vulnerability, it is recommended to apply the latest security updates provided by Microsoft. Users should regularly check for updates and ensure their systems are patched to protect against potential exploitation. Additionally, limiting local access to sensitive systems can help reduce the risk.