CVE-2019-4540

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-02-04 · updated 2026-06-17
Weakness: CWE-327

Description

IBM Security Directory Server 6.4.0 uses weaker than expected cryptographic algorithms that could allow an attacker to decrypt highly sensitive information. IBM X-Force ID: 165813.

Affected products

IBM Security Directory Server: from 6.4.0.0 before 6.4.0.20 — fixed in 6.4.0.20

How to fix

Upgrade to a fixed version: IBM Security Directory Server 6.4.0.20. Check the vendor advisory for mitigations.

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/165813
https://www.ibm.com/support/pages/node/1288660
https://exchange.xforce.ibmcloud.com/vulnerabilities/165813
https://www.ibm.com/support/pages/node/1288660

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