CVE-2017-13098

mediumpriority · track · 42EPSS 0.243 · 98 %ileexploit · functionalEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · functional

Likely / severe?

24.3% (98th) EPSS

CVSS 4.3 · medium

Is it mine?

3 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

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."

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.3–7.5

v2.04.3mediumAV:N/AC:M/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.05.9mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 2.2 · impact 3.6

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · ENISA EU

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · cret@cert.org USexploitability 3.9 · impact 3.6

v3.05.9mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · OSV

v3.05.8mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Fsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-203USprimaryCWE-203US

exploits (1)

Public proof-of-concept and weaponised exploit code.

auxiliary/scanner/ssl/bleichenbacher_oracleScanner for Bleichenbacher Oracle in RSA PKCS #1 v1.5functional · metasploit

affected products (3)

Products and version ranges known to be affected.

Legion of the Bouncy Castle BouncyCastle TLS≤ <1.0.3enisa_euvdEU
bouncycastle bc-java< 1.59nvdUScpe:2.3:a:bouncycastle:bc-java:*:*:*:*:*:*:*:*
Maven org.bouncycastle:bcprov-jdk15on< 1.0.3osvUSpkg:maven/org.bouncycastle/bcprov-jdk15on

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-wrwf-pmmj-w989Observable Discrepancy in BouncyCastle2022-05-13ghsa · osvUS
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."

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2017-12-13modified 2026-06-17

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+881 more

references (30)

External citations — patches, advisories, analysis.

scry

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