HOME VULNERABILITIESCVE-2015-7940

MEDIUM

CVE-2015-7940

CWE-200Published: November 9, 2015· Updated: Jun 17, 2026

5.0

CVSS v3.1

Official Description

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."

Technical Analysis

CVE-2015-7940 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

From a weakness classification perspective (CWE-200): Information exposure vulnerabilities leak sensitive data to unauthorized actors.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.

User Interaction

Scope

Impact

ConfidentialityP

IntegrityNone

AvailabilityNone

AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected Vendors & Products

bouncycastle1 product(s)

bouncy castle crypto package

openSUSE2 product(s)

leapopensuse

Oracle4 product(s)

application testing suiteenterprise manager ops centerpeoplesoft enterprise peopletoolsvirtual desktop infrastructure

Source: NVD CPE · 12 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2015-11/msg00012.html

ADVISORYhttp://www.openwall.com/lists/oss-security/2015/10/22/7

ADVISORYhttp://www.openwall.com/lists/oss-security/2015/10/22/9

ADVISORYhttp://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2015-11/msg00012.html

ADVISORYhttp://www.openwall.com/lists/oss-security/2015/10/22/7

ADVISORYhttp://www.openwall.com/lists/oss-security/2015/10/22/9

ADVISORYhttp://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html

All References (42)

→

http://lists.fedoraproject.org/pipermail/package-announce/2016-January/174915.html

→

http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00012.htmlThird Party Advisory

→

http://rhn.redhat.com/errata/RHSA-2016-2035.html

→

http://rhn.redhat.com/errata/RHSA-2016-2036.html

→

http://web-in-security.blogspot.ca/2015/09/practical-invalid-curve-attacks.htmlTechnical Description

→

http://www.debian.org/security/2015/dsa-3417

→

http://www.openwall.com/lists/oss-security/2015/10/22/7Third Party Advisory · VDB Entry

→

http://www.openwall.com/lists/oss-security/2015/10/22/9Third Party Advisory · VDB Entry

→

http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html

→

http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html

→

http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html

→

http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html

→

http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.htmlThird Party Advisory

→

http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html

→

http://www.securityfocus.com/bid/79091

Quick Facts

CVE IDCVE-2015-7940

CVSS Score5.0 / 10

SeverityMEDIUM

WeaknessCWE-200

CISA KEVNo

Affected3 vendor(s)

PublishedNov 9, 2015

Related CVEs (CWE-200)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2015-7940 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.

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