CVE-2015-7940

What it is

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."

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

4.7% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2015-11-09 16:59 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:33 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 4.7% in the next 30 days (EPSS).
• Severity: 5.0 MEDIUM (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2015-11-09 16:59 UTC

Last modified

2026-06-17 00:33 UTC

Exploit probability

4.7% · EPSS, next 30 days

Weakness

CWE-200 · Information exposure

Record status

Modified

Affected

• Opensuse Leap 42.1
• Opensuse 13.1
• Opensuse 13.2
• Bouncycastle Bouncy Castle Crypto Package ≤ 1.50
• Oracle Application Testing Suite 12.5.0.1
• Oracle Application Testing Suite 12.5.0.2
• Oracle Application Testing Suite 12.5.0.3
• Oracle Enterprise Manager Ops Center 12.1.4

Attack profile CVSS 2.0 · 5.0

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

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