What’s Vulnerable › Vulnerabilities

CVE-2017-13098: BouncyCastle JCE TLS Bleichenbacher/ROBOT

• Severity: medium (CVSS 5.9 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 24.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-12-13 · updated 2026-06-17
• Weakness: CWE-203

Description

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

• Legion of the Bouncy Castle Inc. BC-JAVA: before 1.59 — fixed in 1.59

How to fix

Upgrade to a fixed version: Legion of the Bouncy Castle Inc. BC-JAVA 1.59. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00011.html
• http://www.kb.cert.org/vuls/id/144389
• http://www.securityfocus.com/bid/102195
• https://github.com/bcgit/bc-java/commit/a00b684465b38d722ca9a3543b8af8568e6bad5c
• https://robotattack.org/
• https://security.netapp.com/advisory/ntap-20171222-0001/
• https://www.debian.org/security/2017/dsa-4072
• https://www.oracle.com/security-alerts/cpuoct2020.html
• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00011.html
• http://www.kb.cert.org/vuls/id/144389
• http://www.securityfocus.com/bid/102195
• https://github.com/bcgit/bc-java/commit/a00b684465b38d722ca9a3543b8af8568e6bad5c

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