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OpenSSL, the most widely software library for implementing website and email encryption, has patched a high-severity vulnerability that makes it easy for hackers to completely shut down huge numbers of servers.
OpenSSL provides time-tested cryptographic functions that implement the Transport Layer Security protocol, the predecessor to Secure Sockets Layer that encrypts data flowing between Internet servers and end-user clients. People developing applications that use TLS rely on OpenSSL to save time and avoid programming errors that are common when noncryptographers build applications that use complex encryption.
The crucial role OpenSSL plays in Internet security came into full view in 2014 when hackers began exploiting a critical vulnerability in the open-source code library that let them steal encryption keys, customer information, and other sensitive data from servers all over the world. Heartbleed, as the security flaw was called, demonstrated how a couple lines of faulty code could topple the security of banks, news sites, law firms, and more.
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source https://arstechnica.com/?p=1752244