CVE-2026-36606Public exploit

Credential disclosure via hardcoded backup encryption key

Published Jun 3, 2026 · Updated Jun 3, 2026

Information disclosure in Mercusys AC12G (EU) V1 firmware allows attackers with a configuration backup to recover stored credentials. The backup encryption module passes a shared hardcoded key to DES_set_key_unchecked and applies single DES in ECB mode after compressing configuration TLV data. An authenticated backup download or other access to the backup file is required; decryption exposes administrator, Wi-Fi, PPPoE, DDNS, and guest-network credentials.

CVSS severity7.1
High
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Mercusys AC12G (EU) V1 firmware allows attackers with a configuration backup to recover stored credentials. The backup encryption module passes a shared hardcoded key to DES_set_key_unchecked and applies single DES in ECB mode after compressing configuration TLV data. An authenticated backup download or other access to the backup file is required; decryption exposes administrator, Wi-Fi, PPPoE, DDNS, and guest-network credentials.

The record

CVE
CVE-2026-36606
Published
Jun 3, 2026
Updated
Jun 3, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-798, T1555
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.1CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T1555Credentials from Password Stores

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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