# CVE-2025-9340: Bouncy Castle for Java has Out-of-Bounds Write Vulnerability

Source: https://junglewise.ai/threats/cve-2025-9340-bouncy-castle-for-java-has-out-of-bounds-write-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-08-22  
License: CC BY 4.0 with a link back

CVE-2025-9340 · Severity: medium · CVSS 4 · Published 2025-08-22

Bouncy Castle for Java has Out-of-Bounds Write Vulnerability

Technologies: [org.bouncycastle:bc-fips (Maven)](https://junglewise.ai/threats/technologies/org-bouncycastle-bc-fips). Vendors: [Maven](https://junglewise.ai/threats/vendors/maven).

## Quick answers

**Is CVE-2025-9340 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-9340 being exploited in the wild.

**How severe is CVE-2025-9340?** Medium severity, with a CVSS score of 4, published 22 August 2025.

**Which products and versions are affected?** org.bouncycastle:bc-fips (Maven) ECOSYSTEM:introduced=2.1.0,fixed=2.1.1.

**Is there a fix for CVE-2025-9340?** Yes. org.bouncycastle:bc-fips (Maven): upgrade to 2.1.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-9340?** Check whether you run org.bouncycastle:bc-fips (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- org.bouncycastle:bc-fips (Maven): upgrade to 2.1.1 or later

  ```sh
  # set org.bouncycastle:bc-fips to 2.1.1 in your pom.xml or build.gradle
  ```


## Affected products

- org.bouncycastle:bc-fips (Maven) ECOSYSTEM:introduced=2.1.0,fixed=2.1.1

## Identifiers

- CVE-2025-9340
- GHSA-g6rx-6wfx-gj74

## Related threats

- [Bouncy Castle FIPS sensitive key material zeroisation failure](https://junglewise.ai/threats/cve-2026-13505-bouncy-castle-fips-sensitive-key-material-zeroisation-failure)
- [Bouncy Castle Java FIPS infinite loop in entropy source on Intel platforms](https://junglewise.ai/threats/cve-2026-8798-bouncy-castle-java-fips-infinite-loop-in-entropy-source-on-intel)
- [Bouncy Castle ASN.1 sequence nesting-depth guard bypass](https://junglewise.ai/threats/cve-2026-13506-bouncy-castle-asn-1-sequence-nesting-depth-guard-bypass)
- [Bouncy Castle Name Constraints bypass via trailing dot in rfc822Name and URI](https://junglewise.ai/threats/cve-2026-8763-bouncy-castle-name-constraints-bypass-via-trailing-dot-in)
- [Bouncy Castle BC-LTS GCM decryption failure on X86_64 Linux](https://junglewise.ai/threats/cve-2026-8149-bouncy-castle-bc-lts-gcm-decryption-failure-on-x86-64-linux)