CVE-2016-6116 IBM CVE debrief

Who should care

IBM Tivoli Key Lifecycle Manager administrators, teams operating the affected 2.5/2.6 builds, and security teams responsible for TLS/HTTPS hardening and certificate-based trust on management interfaces.

Technical summary

NVD describes the flaw as a failure to properly enable HTTP Strict Transport Security (HSTS). In practice, that means affected web traffic may not receive the downgrade protections HSTS is intended to provide, increasing exposure to active network interception or other man-in-the-middle attacks. The NVD record lists multiple vulnerable CPE entries across SKLM 2.5 and 2.6 maintenance builds, and the weakness is classified as CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor).

Defensive priority

Medium

Recommended defensive actions

• Confirm whether any IBM Tivoli Key Lifecycle Manager 2.5 or 2.6 instances are still in use and map them to the vulnerable maintenance builds listed by NVD.
• Apply the IBM patch/advisory referenced in the NVD record and verify that HSTS is enabled on the relevant HTTPS endpoints.
• Review reverse proxies, load balancers, and web server front ends to ensure HSTS headers are consistently enforced and not stripped before reaching clients.
• Check for any dependent administrative workflows that traverse untrusted networks and prioritize their remediation or network restriction.
• Retest the service after remediation to confirm HTTPS hardening is active and that clients receive the expected security headers.

Evidence notes

The description states that IBM Tivoli Key Lifecycle Manager 2.5 and 2.6 could allow a remote attacker to obtain sensitive information because HTTP Strict Transport Security was not properly enabled, enabling man-in-the-middle techniques. The NVD metadata marks the issue as CVSS 3.0 5.9 (Medium) with CWE-200, and references an IBM vendor advisory/patch plus a third-party advisory entry.

Official resources