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5.4	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Bouncy Castle Java Library up to 1.50. Affected by this vulnerability is an unknown functionality of the component Diffie-Hellman Key Exchange. Performing a manipulation results in cryptographic issue. This vulnerability is identified as CVE-2015-7940. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

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 cryptographic issue vulnerability. CWE is classifying the issue as CWE-310. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The Bouncy Castle Java library before 1.51 does not validate a point is withing the elliptic curve, which makes it easier for remote attackers to obtain private keys via a series of crafted elliptic curve Diffie Hellman (ECDH) key exchanges, aka an "invalid curve attack."

The weakness was released 11/09/2015 (Website). The advisory is shared at openwall.com. 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 l. 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 Tenable (86740), EUVD (EUVD-2018-0502), SecurityFocus (BID 79091†) and Vulnerability Center (SBV-54590†). Entries connected to this vulnerability are available at VDB-4597, VDB-4598, VDB-80318 and VDB-91505. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Software Library

Vendor

• Bouncy Castle

Name

• Java Library

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27
• 1.28
• 1.29
• 1.30
• 1.31
• 1.32
• 1.33
• 1.34
• 1.35
• 1.36
• 1.37
• 1.38
• 1.39
• 1.40
• 1.41
• 1.42
• 1.43
• 1.44
• 1.45
• 1.46
• 1.47
• 1.48
• 1.49
• 1.50

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

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

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Cryptographic issue
CWE: CWE-310
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 86740
Nessus Name: openSUSE Security Update : bouncycastle (openSUSE-2015-705)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703417
OpenVAS Name: Debian Security Advisory DSA 3417-1 (bouncycastle - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Java Library 1.51

Timelineinfo

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 🔍
09/13/2025 +3581 days 🔍

Sourcesinfo

Advisory: RHSA-2016:2035
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-7940 (🔍)
GCVE (CVE): GCVE-0-2015-7940
GCVE (VulDB): GCVE-100-79101
EUVD: 🔍

OVAL: 🔍

SecurityFocus: 79091 - Bouncy Castle CVE-2015-7940 Information Disclosure Vulnerability
SecurityTracker: 1037036
Vulnerability Center: 54590 - Bouncy Castle Java Library Remote Weak Encryption via a Series of Crafted Elliptic Curve Diffie Hellman Key Exchanges, Medium

See also: 🔍

Entryinfo

Created: 11/10/2015 09:55
Updated: 09/13/2025 04:57
Changes: 11/10/2015 09:55 (64), 04/20/2018 09:11 (13), 06/26/2022 13:37 (4), 09/13/2025 04:57 (17)
Complete: 🔍
Cache ID: 216:108:103

Discussion

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