CVE-2025-9340
native encrypt/decrypt operations in JCE may corrupt data if same byte array used for input and output.
Out-of-bounds Write vulnerability in Legion of the Bouncy Castle Inc. Bouncy Castle for Java bc-fips on All (API modules). This vulnerability is associated with program files org/bouncycastle/jcajce/provider/BaseCipher.
This issue affects Bouncy Castle for Java: from BC-FJA 2.1.0 through 2.1.0.
Attack profile
How easy it is to exploit
- Attack vector
- Physical
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Active
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
native encrypt/decrypt operations in JCE may corrupt data if same byte array used for input and output.
Out-of-bounds Write vulnerability in Legion of the Bouncy Castle Inc. Bouncy Castle for Java bc-fips on All (API modules). This vulnerability is associated with program files org/bouncycastle/jcajce/provider/BaseCipher.
This issue affects Bouncy Castle for Java: from BC-FJA 2.1.0 through 2.1.0.
- Record
CVE-2025-9340- CVSS 4.0
- 0.0 None
CVSS:4.0/AV:P/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/S:N/R:U/RE:M/U:Green - Weakness
- CWE-787
- Updated
- 2026-11-02
EUVDEUVD-2025-25505
Out-of-bounds Write vulnerability in Legion of the Bouncy Castle Inc. Bouncy Castle for Java bc-fips on All (API modules). This vulnerability is associated with program files org/bouncycastle/jcajce/provider/BaseCipher.
This issue affects Bouncy Castle for Java: from BC-FJA 2.1.0 through 2.1.0.
- Record
EUVD-2025-25505- CVSS 4.0
- 0.0 None
CVSS:4.0/AV:P/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/S:N/R:U/RE:M/U:Green - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-g6rx-6wfx-gj74
Bouncy Castle for Java has Out-of-Bounds Write Vulnerability
Out-of-bounds Write vulnerability in Legion of the Bouncy Castle Inc. Bouncy Castle for Java bc-fips on All (API modules). This vulnerability is associated with program files org/bouncycastle/jcajce/provider/BaseCipher.
This issue affects Bouncy Castle for Java: from BC-FJA 2.1.0 through 2.1.0.
- Record
GHSA-g6rx-6wfx-gj74- CVSS 4.0
- 0.0 None
CVSS:4.0/AV:P/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:X/R:U/V:X/RE:M/U:Green - Weakness
- CWE-787
- Updated
- 2026-11-02
NVD
Out-of-bounds Write vulnerability in Legion of the Bouncy Castle Inc. Bouncy Castle for Java bc-fips on All (API modules). This vulnerability is associated with program files org/bouncycastle/jcajce/provider/BaseCipher.
This issue affects Bouncy Castle for Java: from BC-FJA 2.1.0 through 2.1.0.
- Record
CVE-2025-9340- CVSS 4.0
- 0.0 None
CVSS:4.0/AV:P/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:X/R:U/V:X/RE:M/U:Green - Weakness
- CWE-787
- Updated
- 2026-11-02
OSVGHSA-g6rx-6wfx-gj74
Bouncy Castle for Java has Out-of-Bounds Write Vulnerability
Out-of-bounds Write vulnerability in Legion of the Bouncy Castle Inc. Bouncy Castle for Java bc-fips on All (API modules). This vulnerability is associated with program files org/bouncycastle/jcajce/provider/BaseCipher.
This issue affects Bouncy Castle for Java: from BC-FJA 2.1.0 through 2.1.0.
- Record
GHSA-g6rx-6wfx-gj74- CVSS 4.0
- 0.0 None
CVSS:4.0/AV:P/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:X/R:U/V:X/RE:M/U:Green - Weakness
- CWE-787
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
org.bouncycastle:bc-fipsMaven |
2.1.0 to 2.1.0 | 2.1.1 |
org.bouncycastle:bc-fipsMaven |
2.1.0 up to 2.1.1 | 2.1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-9340 is a none vulnerability (CVSS 0.0) in Legion Of The Bouncy Castle Inc. Bouncy Castle For Java, published August 22, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.18%, the 7th percentile. Fixed in org.bouncycastle:bc-fips 2.1.1.