Multiple serious vulnerabilities have been found in OpenSSL. Malicious users can exploit these vulnerabilities to cause denial of service or bypass security restrictions.

Below is a complete list of vulnerabilities pppeep

1. An unknown vulnerability can be exploited remotely via specially designed DTLS message;
2. Improper calculations can be exploited remotely via unspecified vectors;
3. An unknown vulnerability can be exploited remotely via unspecified vectors related to ServerKeyExchange, fingerprint-based certificate-blacklist, Diffie-Hellman certificate;
4. Lack of protocol checking can be exploited remotely via unexpected handshake;
5. An unknown vulnerability can be exploited remotely via RSA-to-EXPORT_RSA downgrade attacks;
6. Memory leak can be exploited remotely via specially designed records.

OpenSSL versions earlier than 0.9.8zd
OpenSSL 1.0.0 versions earlier than 1.0.0p
OpenSSL 1.0.1 versions earlier than 1.0.1k

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OpenSSL bulletin