CVE-2018-5382
The default BKS keystore use an HMAC that is only 16 bits long, which can allow an attacker to compromise the integrity of a BKS keystore.
Does this matter?
Lower severity and a low EPSS score (0.26%). Track it; it rarely justifies an emergency change on its own.
Description
The default BKS keystore use an HMAC that is only 16 bits long, which can allow an attacker to compromise the integrity of a BKS keystore. Bouncy Castle release 1.47 changes the BKS format to a format which uses a 160 bit HMAC instead. This applies to any BKS keystore generated prior to BC 1.47. For situations where people need to create the files for legacy reasons a specific keystore type "BKS-V1" was introduced in 1.49. It should be noted that the use of "BKS-V1" is discouraged by the library authors and should only be used where it is otherwise safe to do so, as in where the use of a 16 bit checksum for the file integrity check is not going to cause a security issue in itself.
- CVSS 3.1
- 4.4 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- EPSS
- 0.26% probability · 18th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-327, CWE-354
- Affected
- bouncycastle/bc-java · redhat/satellite · redhat/satellite capsule
- Source
- cret@cert.org
EPSS 0.3% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/103453Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:2927Third Party Advisory
- https://www.bouncycastle.org/releasenotes.htmlRelease Notes, Vendor Advisory
- https://www.kb.cert.org/vuls/id/306792Third Party Advisory, US Government Resource
- https://www.oracle.com/security-alerts/cpuoct2020.htmlThird Party Advisory
- http://www.securityfocus.com/bid/103453Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:2927Third Party Advisory
- https://www.bouncycastle.org/releasenotes.htmlRelease Notes, Vendor Advisory
- https://www.kb.cert.org/vuls/id/306792Third Party Advisory, US Government Resource
- https://www.oracle.com/security-alerts/cpuoct2020.htmlThird Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.