CVE-2016-6883 Matrixssl CVE debrief

Who should care

Security teams and developers responsible for products or appliances that embed MatrixSSL, especially if TLS/SSL is exposed to untrusted networks and RSA cipher suites are enabled.

Technical summary

NVD describes the issue as affecting MatrixSSL up to version 3.8.2, with vulnerability conditions tied to RSA cipher suites. The weakness is classified as CWE-200, and the CVSS v3.0 vector is AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N, indicating remote exploitation without privileges or user interaction, but with higher attack complexity and confidentiality impact only.

Defensive priority

Medium priority. Upgrade affected MatrixSSL deployments to 3.8.3 or later, and review whether RSA cipher suites are still enabled anywhere they are not required.

Recommended defensive actions

• Upgrade MatrixSSL to version 3.8.3 or later in all affected products.
• Identify whether RSA cipher suites are enabled in your TLS configuration and disable them where feasible.
• Inventory embedded or bundled MatrixSSL instances in appliances, SDKs, and firmware.
• Validate vendor-provided fixes or release notes before redeploying affected components.
• Prioritize external-facing services first, since the issue is network-reachable.

Evidence notes

This debrief is based on the official NVD record and the linked references in the source corpus. NVD lists MatrixSSL versions through 3.8.2 as vulnerable and cites a Bleichenbacher-variant attack with confidentiality impact. The reference set includes an Openwall oss-security mailing list post from 2016-08-19, a SecurityFocus BID entry, and MatrixSSL release notes in CHANGES.md. The CVE record was published on 2017-03-03 and later modified on 2026-05-13; that modified timestamp is not the vulnerability date.

Official resources