CVE-2015-7940: The Bouncy Castle Java library before 1.51 does not validate a point is withing the elliptic curve, which m...

Security readout for executives and security teams

CVE-2015-7940 is a cryptographic flaw in Bouncy Castle Java before 1.51. If a vulnerable application accepts attacker-controlled ECDH exchanges, an attacker may be able to recover private keys over repeated interactions. The issue is old, but legacy Java stacks and bundled dependencies can keep it alive. Exposure is most likely in Java applications, appliances, or enterprise products that bundle Bouncy Castle Java before 1.51 and use it for reachable ECDH operations. Distribution and vendor advisories indicate downstream packaging impact, but the bundle does not provide a complete product list. Prioritize remediation for internet-facing or partner-facing Java services using ECDH through Bouncy Castle. Legacy internal systems still deserve review because private key exposure can undermine confidentiality beyond a single application. Mitigation focus: Upgrade Bouncy Castle Java to version 1.51 or later.; Apply relevant OS or vendor security updates for packaged Bouncy Castle components.; Check Oracle, Red Hat, Debian, Ubuntu, Fedora, and SUSE guidance where applicable..

Prepared

Jun 13, 2026, 21:45 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.