CVE & CISA-KEV Catalog

CVE-2015-7940

MEDIUMEPSS 91th pctl
5.0
CVSS v2
NVD

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."

CWE-200Information ExposureCWE-310Cryptographic Issues

How to fix

Remediation Available
bouncycastleDebian
Fixed in:1.51-1CVE-2015-7940
Fixed in:1.51-1CVE-2015-7940
Fixed in:1.51-1CVE-2015-7940
Fixed in:1.51-1CVE-2015-7940
bouncycastleUbuntu
Fixed in:1.49+dfsg-2ubuntu0.1USN-3727-1
libbcmail-javaUbuntu
Fixed in:1.49+dfsg-2ubuntu0.1USN-3727-1
libbcpg-javaUbuntu
Fixed in:1.49+dfsg-2ubuntu0.1USN-3727-1
libbcpkix-javaUbuntu
Fixed in:1.49+dfsg-2ubuntu0.1USN-3727-1
libbcprov-javaUbuntu
Fixed in:1.49+dfsg-2ubuntu0.1USN-3727-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

4.82%probability of exploitation in 30 days
91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Technical Description1

Related Vulnerabilities

Other CWE-200 (Information Exposure) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2024-24919High8.6100%KEV + Ransom-
CVE-2020-14181Medium5.3100%-Fix
CVE-2021-34429Medium5.399%-Fix
CVE-2018-11409Medium5.398%--
CVE-2021-41277Critical10.097%KEV-
CVE-2016-2183High7.596%-Fix

Common questions

How do I fix CVE-2015-7940?

Published advisories record a fix for 6 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2015-7940 being actively exploited?

Not that we know of. CVE-2015-7940 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 4.8% is the estimated probability that it will be exploited in the next 30 days. That is higher than 91% of all scored CVEs.

How severe is CVE-2015-7940?

CVE-2015-7940 has a CVSS v2 base score of 5.0, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2015-7940 affect?

Published advisories record a fix for bouncycastle (Debian), bouncycastle (Ubuntu), libbcmail-java (Ubuntu), libbcpg-java (Ubuntu), and 2 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.