How severe is CVE-2025-9340?

CVE-2025-9340 has a CVSS 4.0 base score of 0.0, rated none severity.

Is CVE-2025-9340 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-9340?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-9340 have an EU (EUVD) identifier?

Yes. CVE-2025-9340 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25505.

When was CVE-2025-9340 published?

CVE-2025-9340 was published on 2025-08-22 and last updated on 2026-06-17.

CVE-2025-9340

CVE-2025-9340 is a none-severity vulnerability with a CVSS 4.0 base score of 0.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: None (CVSS 4.0 base score 0.0)
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-25505
Weakness: CWE-787
Published: 2025-08-22
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2025-9340?: 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.
How severe is CVE-2025-9340?: CVE-2025-9340 has a CVSS 4.0 base score of 0.0, rated none severity.
Is CVE-2025-9340 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-9340?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-9340 have an EU (EUVD) identifier?: Yes. CVE-2025-9340 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25505.
When was CVE-2025-9340 published?: CVE-2025-9340 was published on 2025-08-22 and last updated on 2026-06-17.

References

https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902025%E2%80%909340

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