CVE-2016-9892 Eset CVE debrief

Who should care

Security teams managing ESET Endpoint Antivirus or Endpoint Security on macOS, especially environments that rely on network-based license activation or that may be exposed to hostile or intercepted network paths.

Technical summary

The weakness is a certificate-validation failure (CWE-295) in esets_daemon on macOS. According to NVD, affected products include ESET Endpoint Antivirus for macOS and Endpoint Security for macOS in the vulnerable versions listed in the record. The flaw affects trust in the activation channel to edf.eset.com, allowing forged server responses if an attacker can position themselves as a man-in-the-middle. NVD rates the issue CVSS 3.0 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N, indicating network reachability with high attack complexity and integrity impact. The CVE description additionally warns that it can be combined with CVE-2016-0718.

Defensive priority

Medium. Treat as higher urgency if the affected macOS ESET products are deployed in environments where activation traffic could be intercepted or where the chained CVE-2016-0718 impact is a concern.

Recommended defensive actions

• Verify whether any macOS systems run ESET Endpoint Antivirus or Endpoint Security versions covered by the CVE record and upgrade to a fixed release at or above the vendor-published remediation level.
• Review vendor advisory guidance from ESET for any required update, configuration, or reactivation steps after patching.
• Prefer direct, trusted network paths for activation and monitor for anomalous TLS interception or unexpected activation failures.
• If remediation is delayed, reduce exposure by limiting network interception opportunities and prioritizing systems that handle sensitive or privileged workloads.
• Track whether any internal processes depend on ESET license activation traffic so remediation can be tested without disrupting endpoint protection.

Evidence notes

This debrief is based on the supplied CVE record and NVD metadata. The CVE description explicitly states that esets_daemon did not properly verify the X.509 certificate for edf.eset.com, and that a MITM attacker could spoof the server with a self-signed certificate. The record also notes possible chaining with CVE-2016-0718. The CVE published date used for timing context is 2017-03-02T23:59:00.187Z. Note: the CVE description says versions before 6.4.168.0, while the NVD CPE criteria in the supplied source item list macOS entries for 6.3.70.1; both are preserved here as-source without reconciliation beyond that.

Official resources