High
Logic error in Legion of the Bouncy Castle BC Java
An issue was discovered in Legion of the Bouncy Castle BC Java 1.65 and 1.66. The OpenBSDBCrypt.checkPassword utility method compared incorrect data when checking the password, allowing incorrect passwords to indicate they were matching with previously hashed ones that were different.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.bouncycastle:bcprov-ext-jdk15on | >= 1.65, < 1.67 | 1.67 |
| Java / Kotlin (Maven) | org.bouncycastle:bcprov-ext-jdk16 | >= 1.65, < 1.67 | 1.67 |
| Java / Kotlin (Maven) | org.bouncycastle:bcprov-jdk14 | >= 1.65, < 1.67 | 1.67 |
| Java / Kotlin (Maven) | org.bouncycastle:bcprov-jdk15 | >= 1.65, < 1.67 | 1.67 |
| Java / Kotlin (Maven) | org.bouncycastle:bcprov-jdk15on | >= 1.65, < 1.67 | 1.67 |
| Java / Kotlin (Maven) | org.bouncycastle:bcprov-jdk15to18 | >= 1.65, < 1.67 | 1.67 |
| Java / Kotlin (Maven) | org.bouncycastle:bcprov-jdk16 | >= 1.65, < 1.67 | 1.67 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2020-28052
- https://github.com/bcgit/bc-java/commit/97578f9b7ed277e6ecb58834e85e3d18385a4219
- https://www.synopsys.com/blogs/software-security/cve-2020-28052-bouncy-castle
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://www.bouncycastle.org/releasenotes.html
- https://lists.apache.org/thread.html/rfc0db1f3c375087e69a239f9284ded72d04fbb55849eadde58fa9dc2@%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/rf9abfc0223747a56694825c050cc6b66627a293a32ea926b3de22402@%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/rdfd2901b8b697a3f6e2c9c6ecc688fd90d7f881937affb5144d61d6e@%3Ccommits.druid.apache.org%3E
- https://lists.apache.org/thread.html/rddd2237b8636a48d573869006ee809262525efb2b6ffa6eff50d2a2d@%3Cjira.kafka.apache.org%3E
- https://lists.apache.org/thread.html/rdcbad6d8ce72c79827ed8c635f9a62dd919bb21c94a0b64cab2efc31@%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/rcd37d9214b08067a2e8f2b5b4fd123a1f8cb6008698d11ef44028c21@%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/rc9e441c1576bdc4375d32526d5cf457226928e9c87b9f54ded26271c@%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/r954d80fd18e9dafef6e813963eb7e08c228151c2b6268ecd63b35d1f@%3Ccommits.druid.apache.org%3E
- https://lists.apache.org/thread.html/r8c36ba34e80e05eecb1f80071cc834d705616f315b634ec0c7d8f42e@%3Cissues.solr.apache.org%3E
- https://lists.apache.org/thread.html/r77af3ac7c3bfbd5454546e13faf7aec21d627bdcf36c9ca240436b94@%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/r4e1619cfefcd031fac62064a3858f5c9229eef907bd5d8ef14c594fc@%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/r37d332c0bf772f4982d1fdeeb2f88dd71dab6451213e69e43734eadc@%3Ccommits.pulsar.apache.org%3E
- https://lists.apache.org/thread.html/r30a139c165b3da6e0d5536434ab1550534011b1fdfcd2f5d95892c5b@%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/r2ddabd06d94b60cfb0141e4abb23201c628ab925e30742f61a04d013@%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/r25d53acd06f29244b8a103781b0339c5e7efee9099a4d52f0c230e4a@%3Ccommits.druid.apache.org%3E
- https://lists.apache.org/thread.html/r175f5a25d100dbe2b1bd3459b3ce882a84c3ff91b120ed4ff2d57b53@%3Ccommits.pulsar.apache.org%3E
- https://lists.apache.org/thread.html/r167dbc42ef7c59802c2ca1ac14735ef9cf687c25208229993d6206fe@%3Cissues.karaf.apache.org%3E
- https://github.com/bcgit/bc-java/wiki/CVE-2020-28052
- https://github.com/bcgit/bc-java
CVSS score
8.1/10
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-670- Platform
- Java / Kotlin (Maven)
- Package
org.bouncycastle:bcprov-ext-jdk15on, org.bouncycastle:bcprov-ext-jdk16, org.bouncycastle:bcprov-jdk14- Disclosed
- 30.04.2021
- Updated
- 11.10.2026 12:21
Sources and licenses
OSV / GitHub Advisory Database - GHSA-73xv-w5gp-frxh - CC BY 4.0
Vulnerability history: org.bouncycastle:bcprov-ext-jdk15on
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 5
- First → latest
- 04.2021 11.2023
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 4
Disclosures per year
- 2021: 3
- 2022: 0
- 2023: 2
- 2024: 0
- 2025: 0
- 2026: 0
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Logic error in Legion of the Bouncy Castle BC Java this entry
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