OpenSSL up to 0.9.8/1.0.0q/1.0.1l/1.0.2 SSLv2 s2_srvr.c get_client_master_key information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability has been found in OpenSSL up to 0.9.8/1.0.0q/1.0.1l/1.0.2 (Network Encryption Software) and classified as critical. Affected by this vulnerability is the function get_client_master_key of the file s2_srvr.c of the component SSLv2 Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was shared 03/02/2016 by Alex with University of Michigan (Website). It is possible to read the advisory at This vulnerability is known as CVE-2016-0704 since 12/15/2015. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 82783 (CentOS 5 : openssl (CESA-2015:0800) (FREAK)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks and running in the context local. The commercial vulnerability scanner Qualys is able to test this issue with plugin 350021 (Amazon Linux Security Advisory for openssl098e: ALAS-2016-682).

Upgrading to version 0.9.8zf, 1.0.0r, 1.0.1m or 1.0.2a eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at SecurityFocus (BID 83764), X-Force (111146), Vulnerability Center (SBV-57002) and Tenable (82783). The entries 68520, 74747, 81112 and 81138 are related to this item.




CPE 2.3infoedit

CPE 2.2infoedit


VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.9
VulDB Temp Score: 5.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
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VulDB Base Score: 🔍
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Class: Information disclosure
CWE: CWE-200
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 82783
Nessus Name: CentOS 5 : openssl (CESA-2015:0800) (FREAK)
Nessus File: 🔍
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OpenVAS ID: 14611
OpenVAS Name: Amazon Linux Local Check: alas-2016-682
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OpenVAS Family: 🔍

Qualys ID: 🔍
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Threat Intelligenceinfoedit

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Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: OpenSSL 0.9.8zf/1.0.0r/1.0.1m/1.0.2a


04/14/2015 🔍
04/15/2015 +1 days 🔍
12/15/2015 +245 days 🔍
02/29/2016 +76 days 🔍
03/01/2016 +1 days 🔍
03/02/2016 +0 days 🔍
03/02/2016 +0 days 🔍
03/03/2016 +1 days 🔍
03/05/2016 +2 days 🔍
02/13/2017 +345 days 🔍
09/01/2018 +564 days 🔍



Researcher: Alex
Organization: University of Michigan
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-0704 (🔍)

SecurityFocus: 83764 - OpenSSL CVE-2016-0704 Information Disclosure Vulnerability
X-Force: 111146 - OpenSSL Bleichenbacher security bypass
Vulnerability Center: 57002 - OpenSSL Remote Restriction Bypass in SSLv2 - CVE-2016-0704, Medium

See also: 🔍


Created: 03/03/2016 10:19 AM
Updated: 09/01/2018 08:39 AM
Changes: (26) vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai vulnerability_cvss3_vuldb_av vulnerability_cvss3_vuldb_ac vulnerability_cvss3_vuldb_pr vulnerability_cvss3_vuldb_ui vulnerability_cvss3_vuldb_s vulnerability_cvss3_vuldb_c vulnerability_cvss3_vuldb_i vulnerability_cvss3_vuldb_a advisory_person_nickname advisory_company_name advisory_confirm_url countermeasure_date source_cve_assigned source_oval_id source_securityfocus_date source_securityfocus_class source_openvas_id source_openvas_filename source_openvas_title source_openvas_family
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