OpenSSL SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG Session Resume Ciphersuite Downgrade Issue

medium Nessus Plugin ID 51892


The remote host allows resuming SSL sessions with a weaker cipher than the one originally negotiated.


The version of OpenSSL on the remote host has been shown to allow resuming session with a weaker cipher than was used when the session was initiated. This means that an attacker that sees (i.e., by sniffing) the start of an SSL connection can manipulate the OpenSSL session cache to cause subsequent resumptions of that session to use a weaker cipher chosen by the attacker.

Note that other SSL implementations may also be affected by this vulnerability.


Upgrade to OpenSSL 0.9.8q / 1.0.0.c or later, or contact your vendor for a patch.

See Also

Plugin Details

Severity: Medium

ID: 51892

File Name: openssl_resume_different_cipher.nasl

Version: 1.24

Type: remote

Family: General

Published: 2/7/2011

Updated: 4/11/2022

Configuration: Enable thorough checks

Risk Information


Risk Factor: Low

Score: 2.7


Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N

Temporal Vector: E:U/RL:OF/RC:C

Vulnerability Information

CPE: cpe:/a:openssl:openssl

Required KB Items: SSL/Resume/Weaker

Exploit Ease: No known exploits are available

Patch Publication Date: 12/2/2010

Vulnerability Publication Date: 12/2/2010

Reference Information

CVE: CVE-2010-4180

BID: 45164