CVE-2026-78221
Description
A flaw was found in OpenVPN. An incorrect buffer size calculation within the Windows Interactive Service allows local authenticated users to trigger memory corruption or disclose sensitive information. This vulnerability can be exploited by providing specially crafted inputs.
Statement
Important: This vulnerability affects the Windows Interactive Service component of OpenVPN, allowing local authenticated users to cause memory corruption or information disclosure. Red Hat's OpenVPN packages, available in Community Projects like Fedora and EPEL, are Linux-based and do not include the vulnerable Windows-specific service, thus are not directly impacted by this flaw.
Understanding the Weakness (CWE)
Integrity,Confidentiality,Availability
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Buffer overflows often can be used to execute arbitrary code, which is usually outside the scope of the product's implicit security policy. This can often be used to subvert any other security service.
Availability
Technical Impact: Modify Memory; DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU)
Buffer overflows generally lead to crashes. Other attacks leading to lack of availability are possible, including putting the product into an infinite loop.
Frequently Asked Questions
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