cygcrypto-1.1.dll is a core library for the OpenSSL Toolkit within the
: If you downloaded the DLL separately, right-click it, go to Properties , and click if the option exists under the General tab. Step 3: Troubleshooting Dependencies
Why “2021” is misleading
Cygwin and its libraries are continuously updated. Version numbers reflect OpenSSL releases, not the year. For example, cygcrypto-1.1.dll corresponds to OpenSSL 1.1.x series. The year 2021 has no specific meaning in this context.
If you meant cygcrypto-1.1.dll instead, the text would simply change to reflect that corrected name. Please confirm if this is a typo or a specific custom build.
Vulnerability Tracking: In 2021, users were encouraged to update their Cygwin environments to address vulnerabilities in OpenSSL (such as CVE-2021-3711 and CVE-2021-3712) that could lead to buffer overflows or denial-of-service attacks.