CVE-2015-7940

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."

Category

5.0
CVSS
Severity: Medium
CVSS 2.0 •
EPSS 0.75% Top 30%
Vendor Advisory redhat.com Vendor Advisory opensuse.org Vendor Advisory fedoraproject.org Vendor Advisory redhat.com Vendor Advisory ubuntu.com Vendor Advisory debian.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://rhn.redhat.com/errata/RHSA-2016-2035.html vendor advisory
http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
http://www.securityfocus.com/bid/79091 vdb entry
http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00012.html third party advisory vendor advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-January/174915.html vendor advisory
http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html third party advisory
http://rhn.redhat.com/errata/RHSA-2016-2036.html vendor advisory
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
https://usn.ubuntu.com/3727-1/ vendor advisory
http://www.openwall.com/lists/oss-security/2015/10/22/9 mailing list vdb entry third party advisory
http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
http://www.securitytracker.com/id/1037036 vdb entry
http://www.openwall.com/lists/oss-security/2015/10/22/7 mailing list vdb entry third party advisory
http://www.debian.org/security/2015/dsa-3417 vendor advisory
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
http://web-in-security.blogspot.ca/2015/09/practical-invalid-curve-attacks.html technical description
http://www.securitytracker.com/id/1037046 vdb entry
http://www.securitytracker.com/id/1037053 vdb entry
https://www.oracle.com/security-alerts/cpuapr2020.html

Frequently Asked Questions

What is the severity of CVE-2015-7940?
CVE-2015-7940 has been scored as a medium severity vulnerability.
How to fix CVE-2015-7940?
To fix CVE-2015-7940, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2015-7940 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2015-7940 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.