Quick answers
- Is CVE-2026-36618 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-36618 being exploited in the wild.
- How severe is CVE-2026-36618?
- Informational severity, with a CVSS score of 3.7, published 3 June 2026.
- Which products and versions are affected?
- Mercusys AC12G (EU) V1 AC12G(EU)_V1_200909, AC12G(EU)_V1_210128.
- Is there a fix for CVE-2026-36618?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-36618 attacked?
- It is attacked from the adjacent network, in a network appliance.
- Am I affected by CVE-2026-36618?
- Check whether you run Mercusys AC12G (EU) V1. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The Mercusys AC12G (EU) V1 router's DNS resolver (Unbound 1.22.0) is configured to respond to CHAOS class TXT queries for 'version.bind' and 'hostname.bind'. An attacker on the local area network (LAN) can send these queries to the router to receive the exact software version and the internal hostname ('mms-unbound'). This information exposure (CWE-200) allows an adversary to identify the specific device type and research known vulnerabilities for that particular version of Unbound. The manufacturer has reportedly designated this product as end-of-life, and no official patch is expected.
Affected products
- Mercusys AC12G (EU) V1 AC12G(EU)_V1_200909, AC12G(EU)_V1_210128
Timeline
- 2026-06-03: advisory: NVD and researcher advisory published