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Vulnerabilities

Vulnerability · CVE-2025-9340

Out-of-bounds Write vulnerability in Legion of the Bouncy Castle Inc.

Published Aug 22, 2025 · catalog updated Aug 22, 2025 · Legion of the Bouncy Castle Inc. Bouncy Castle for Java

Last checked Oct 29, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-9340. EPSS is 0.18%. Act only if a listed version of Legion of the Bouncy Castle Inc. Bouncy Castle for Java is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
None0.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.18%
Remediation
Vendor / distro source
Affected products
vendor Legion of the Bouncy Castle Inc. Bouncy Castle for Java BC-FJA 2.1.0 ≤2.1.0

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Legion of the Bouncy Castle Inc. Bouncy Castle for Java BC-FJA 2.1.0 ≤2.1.0BC-FJA 2.1.0 ≤2.1.0

How to fix CVE-2025-9340

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-9340. EPSS is 0.18%. Act only if a listed version of Legion of the Bouncy Castle Inc. Bouncy Castle for Java is installed.

Which versions are affected?

Compare what you have installed with Legion of the Bouncy Castle Inc. Bouncy Castle for Java BC-FJA 2.1.0 ≤2.1.0 BC-FJA 2.1.0 ≤2.1.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.18%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 22, 2025 · EUVD

    Detected

    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.

  2. Aug 22, 2025 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2025-9340

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-9340

    30-day exploitation probability 0.18%

    first.org
  • EUVDVulnerability recordEUVD-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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 29, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 22, 2026
  • EUVDOct 22, 2026