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TLS/SSL Server Supports RC4 Cipher Algorithms (CVE-2013-2566)

Severity CVSS Published Added Modified
4 (AV:N/AC:M/Au:N/C:P/I:N/A:N) March 12, 2013 September 18, 2014 October 30, 2017


Recent cryptanalysis results exploit biases in the RC4 keystream to recover repeatedly encrypted plaintexts. As a result, RC4 can no longer be seen as providing a sufficient level of security for SSL/TLS sessions. It has many single-byte biases, which makes it easier for remote attackers to conduct plaintext-recovery attacks via statistical analysis of ciphertext in a large number of sessions that use the same plaintext.

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