CVE-2016-1000343 In Bouncy Castle JCE Provider the DSA key pair generator generates a weak private key if used with default values
The Bouncy Castle JCE Provider generates weak DSA private keys when using default values, potentially compromising cryptographic security.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2016-1000343?
CVE-2016-1000343 is a high-severity vulnerability in Bouncycastle Bc-Java, published on 4 Jun 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Bouncy Castle JCE Provider version 1.55 and earlier the DSA key pair generator generates a weak private key if used with default values. If the JCA key pair generator is not explicitly initialised with DSA parameters, 1.55 and earlier generates a private value assuming a 1024 bit key size. In earlier releases this can be dealt with by explicitly passing parameters to the key pair generator.
Weakness: CWE-310
Which versions are affected by CVE-2016-1000343?
6 open source packages ship an affected version, including org.bouncycastle:bcprov-jdk14, org.bouncycastle:bcprov-jdk15 and org.bouncycastle:bcprov-jdk15on. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
org.bouncycastle:bcprov-jdk14 Maven | All versions | 1.56 |
org.bouncycastle:bcprov-jdk14 Maven | All versions | 1.56 |
org.bouncycastle:bcprov-jdk15 Maven | All versions | 1.56 |
org.bouncycastle:bcprov-jdk15 Maven | All versions | 1.56 |
org.bouncycastle:bcprov-jdk15on Maven | All versions | 1.56 |
org.bouncycastle:bcprov-jdk15on Maven | All versions | 1.56 |
Products include Bouncycastle Bc-Java, Debian Debian Linux.
How do I fix CVE-2016-1000343?
Upgrade org.bouncycastle:bcprov-jdk14 to 1.56 or later.
Is CVE-2016-1000343 being exploited?
There is no known exploitation of CVE-2016-1000343 in the wild and no public exploit code.
Other vulnerabilities in Bouncycastle Bc-Java
- CVE-2007-6721 Legion of the Bouncy Castle Java Cryptography API Bleichenbacher Oracle Vulnerability
- CVE-2018-1000613 Deserialization of Untrusted Data in Bouncy castle
- CVE-2026-58062 Stapled OCSP response accepted without binding to the checked certificate
- CVE-2026-59638 JSSE hostname verifier CN-fallback enabled by default despite documented opt-in
- CVE-2026-59650 MTI/A0 DH agreement exponentiates unvalidated peer value
Sources
Also known as DEBIAN-CVE-2016-1000343, GHSA-rrvx-pwf8-p59p, UBUNTU-CVE-2016-1000343.