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VulnerabilityPublished

CVE-2026-36613: Mercusys AC12G · Out-of-bounds Read

Source CVE Database V5

0

Not known to be exploited · CVSS 4.3 Medium.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 3.1 base score
4.3Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

AI-suggested

Until an official fix is released, limit access to the device's management interface to trusted networks and monitor for unusual HTTP POST requests to undefined paths. No official remediation or temporary fix is currently documented.

Description

Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 has a vulnerability where it returns 128 bytes of uninitialized internal buffer data in response to HTTP POST requests to undefined paths. This behavior exposes server state information to unauthenticated attackers on adjacent networks. The vulnerability has a CVSS score of 4.3, indicating medium severity. No patch or official remediation information is currently available.

References

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