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

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
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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.