In the Bouncy Castle JCE Provider versions 1.51 to 1.55, a carry propagation bug was introduced in the implementation of squaring for several raw math classes have been fixed (org.bouncycastle.math.raw.Nat???). These classes are used by our custom elliptic curve implementations (org.bouncycastle.math.ec.custom.**), so there was the possibility of rare (in general usage) spurious calculations for elliptic curve scalar multiplications. Such errors would have been detected with high probability by the output validation for our scalar multipliers.
CVE-2016-1000340
HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 39% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 7.5Exploit: NoneExposed: 0
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5(medium)
- EPSS
- 80.9%
- KEV
- Not listed
Published
June 4, 2018
Last Modified
May 12, 2025
References (10)
- cve@mitrehttps://access.redhat.com/errata/RHSA-2018:2669
- cve@mitrehttps://access.redhat.com/errata/RHSA-2018:2927
- cve@mitrehttps://github.com/bcgit/bc-java/commit/790642084c4e0cadd47352054f868cc8397e2c00#diff-e5934feac8203ca0104ab291a3560a31
- cve@mitrehttps://security.netapp.com/advisory/ntap-20181127-0004/
- cve@mitrehttps://www.oracle.com/security-alerts/cpuoct2020.html
- af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2018:2669
- af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2018:2927
- af854a3a-2127-422b-91ae-364da2661108https://github.com/bcgit/bc-java/commit/790642084c4e0cadd47352054f868cc8397e2c00#diff-e5934feac8203ca0104ab291a3560a31
- af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20181127-0004/
- af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com/security-alerts/cpuoct2020.html
Vendor Advisories for CVE-2016-1000340(2)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Frequently asked(5)
What is CVE-2016-1000340?
CVE-2016-1000340 is a high vulnerability published on June 4, 2018. In the Bouncy Castle JCE Provider versions 1.51 to 1.55, a carry propagation bug was introduced in the implementation of squaring for several raw math classes have been fixed (org.bouncycastle.math.raw.Nat???). These classes are used by our custom elliptic curve implementations…
When was CVE-2016-1000340 disclosed?
CVE-2016-1000340 was first published in the National Vulnerability Database on June 4, 2018, with the most recent update on May 12, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-1000340 actively exploited?
CVE-2016-1000340 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 80.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2016-1000340?
CVE-2016-1000340 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2016-1000340?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-1000340, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2016-1000340
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