CVE-2017-13098: Bouncycastle Bc-Java

Medium severity, CVSS 5.9. EPSS: 24.3% chance of exploitation in the next 30 days.

BouncyCastle TLS prior to version 1.0.3, when configured to use the JCE (Java Cryptography Extension) for cryptographic functions, provides a weak Bleichenbacher oracle when any TLS cipher suite using RSA key exchange is negotiated. An attacker can recover the private key from a vulnerable application. This vulnerability is referred to as "ROBOT."

Affected products

• Bouncycastle Bc-Java: before 1.59 (fixed in 1.59)

Published 2017-12-13. Last modified 2026-06-17.