BouncyCastle JCE TLS Bleichenbacher/ROBOT
Priority MEDIUM 54CWE-203Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-203.
Summary
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."
Why it matters now
EPSS 0.24282 97th percentileScored 2026-11-07
Fix Partial BouncyCastle TLS (Legion of the Bouncy Castle): 1.0.3org.bouncycastle:bcprov-jdk15on (Maven): 1.0.3Red Hat: 2 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Legion of the Bouncy Castle Inc. | BouncyCastle TLS | before 1.0.3 | 1.0.3 | Patch available | CNA |
| — | org.bouncycastle:bcprov-jdk15on (Maven) | before 1.0.3 | 1.0.3 | Patch available | GHSA-wrwf-pmmj-w989 |
- BouncyCastle TLS VendorLegion of the Bouncy Castle Inc. Affected before 1.0.3 Fixed in 1.0.3 Patch available CNA
- org.bouncycastle:bcprov-jdk15on (Maven) Vendor— Affected before 1.0.3 Fixed in 1.0.3 Patch available GHSA-wrwf-pmmj-w989
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:bouncycastle:bc-java:*:*:*:*:*:*:*:* | before 1.59 | Vulnerable | Legion of the Bouncy Castle Inc. |
- cpe:2.3:a:bouncycastle:bc-java:*:*:*:*:*:*:*:* Versions before 1.59 Vulnerable ·Legion of the Bouncy Castle Inc.
Remediation
- Fix · CNA BouncyCastle TLS (Legion of the Bouncy Castle) Fixed in 1.0.3
- Fix · GHSA-wrwf-pmmj-w989 org.bouncycastle:bcprov-jdk15on (Maven) Fixed in 1.0.3 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Satellite 6 | Affected | No fix yet |
| Red Hat Subscription Asset Manager | Affected | No fix planned: Will not fix |
Not affected: 6 products
- Red Hat JBoss Data Grid 7
- Red Hat JBoss Data Virtualization 6
- Red Hat JBoss Enterprise Application Platform 7
- Red Hat Single Sign-On 7
- Red Hat Software Collections
- Red Hat Virtualization 4
Timeline
- 2026-10-02 Threatist record created from CVE-2017-13098
- 2026-10-03 Alias added: GHSA-wrwf-pmmj-w989
References
Advisory 6
More Legion of the Bouncy Castle Inc. Bc-java vulnerabilities
- TI-2018-15967 Legion of the Bouncy Castle Legion of the Bouncy Castle Java Cryptography APIs 1.58 up to… CVSS 3.1CRITICAL 9.8
- TI-2026-42545 MTI/A0 DH agreement exponentiates unvalidated peer value CVSS 4.0CRITICAL 9.3
- TI-2026-42533 JSSE hostname verifier CN-fallback enabled by default despite documented opt-in CVSS 4.0CRITICAL 9.3
- TI-2026-41816 Stapled OCSP response accepted without binding to the checked certificate CVSS 4.0CRITICAL 9.3
- TI-2026-07701 Name Constraints bypass via trailing dot in rfc822Name and URI CVSS 4.0CRITICAL 9.3
- TI-2007-06415 The Legion of the Bouncy Castle Java Cryptography API before release 1.38, as used in… CVSS 2.0HIGH 10.0
Sources
- CVE-2017-13098 · CVE Program
- CVE-2017-13098 · NVD
- FIRST EPSS
- GHSA-wrwf-pmmj-w989 · GitHub Advisory Database · CC BY 4.0
- CVE-2017-13098 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences