Bouncy Castle Java Library up to 1.50 Diffie-Hellman Key Exchange cryptographic issues

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability classified as critical has been found in Bouncy Castle Java Library up to 1.50 (Software Library). This affects an unknown functionality of the component Diffie-Hellman Key Exchange. The manipulation with an unknown input leads to a weak encryption vulnerability. CWE is classifying the issue as CWE-310. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was released 11/09/2015 (Website). The advisory is shared at This vulnerability is uniquely identified as CVE-2015-7940 since 10/22/2015. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1600 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 86740 (openSUSE Security Update : bouncycastle (openSUSE-2015-705)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context local. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370164 (Oracle VM VirtualBox Multiple Vulnerabilities).

Upgrading to version 1.51 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 79091), Vulnerability Center (SBV-54590) and Tenable (86740). Entries connected to this vulnerability are available at 4597, 4598, 80318 and 91505.





CPE 2.3infoedit

CPE 2.2infoedit


VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
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Class: Weak encryption
CWE: CWE-310
ATT&CK: T1600

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Current Price Estimation: 🔍


Nessus ID: 86740
Nessus Name: openSUSE Security Update : bouncycastle (openSUSE-2015-705)
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OpenVAS ID: 703417
OpenVAS Name: Debian Security Advisory DSA 3417-1 (bouncycastle - security update)
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Threat Intelligenceinfoedit

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Recommended: Upgrade
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0-Day Time: 🔍

Upgrade: Java Library 1.51


10/22/2015 🔍
10/23/2015 +1 days 🔍
11/05/2015 +13 days 🔍
11/05/2015 +0 days 🔍
11/09/2015 +4 days 🔍
11/09/2015 +0 days 🔍
11/09/2015 +0 days 🔍
11/10/2015 +1 days 🔍
11/24/2015 +14 days 🔍
03/19/2018 +846 days 🔍
04/20/2018 +32 days 🔍


Status: Not defined
Confirmation: 🔍

CVE: CVE-2015-7940 (🔍)

SecurityFocus: 79091 - Bouncy Castle CVE-2015-7940 Information Disclosure Vulnerability
Vulnerability Center: 54590 - Bouncy Castle Java Library Remote Weak Encryption via a Series of Crafted Elliptic Curve Diffie Hellman Key Exchanges, Medium

See also: 🔍


Created: 11/10/2015 09:55 AM
Updated: 04/20/2018 09:11 AM
Changes: (13) vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai advisory_confirm_url countermeasure_date source_cve_assigned source_oval_id source_securityfocus source_securityfocus_date source_securityfocus_class
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