Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-g6rx-6wfx-gj74
Advisory ID github_osv/GHSA-g6rx-6wfx-gj74
Aliases CVE-2025-9340
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-787 Out-of-bounds Write
System Score Found at
cvssv4 0.0 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/08/GHSA-g6rx-6wfx-gj74/GHSA-g6rx-6wfx-gj74.json
generic_textual LOW
Reference id Reference type URL
https://github.com/bcgit/bc-java
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902025%E2%80%909340
CVE-2025-9340 https://nvd.nist.gov/vuln/detail/CVE-2025-9340
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: 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 Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/08/GHSA-g6rx-6wfx-gj74/GHSA-g6rx-6wfx-gj74.json
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-08-22T10:37:04Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2025/9xxx/CVE-2025-9340.json

Source Advisory: vulnrichment/CVE-2025-9340

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'no'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]

Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-08-22T10:37:04Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2025/9xxx/CVE-2025-9340.json

Source Advisory: vulnrichment/CVE-2025-9340

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'no'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]