CVE-2026-36607: n/a
The Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 is vulnerable to unauthenticated brute-force attacks via its TDDP password change endpoint. This endpoint lacks rate limiting, unlike the login endpoint, allowing an attacker on the adjacent network to attempt unlimited password guesses without triggering account lockout. The vulnerability has a high severity with a CVSS score of 8.8.
AI Analysis
Technical Summary
CVE-2026-36607 describes a vulnerability in the Mercusys AC12G (EU) V1 router firmware AC12G(EU)_V1_200909 where the TDDP password change endpoint (code=10) does not implement rate limiting. This allows unauthenticated attackers on the adjacent network to perform brute-force password attempts without account lockout, bypassing protections present on the login endpoint (code=7). The vulnerability is classified under CWE-307 (Improper Restriction of Excessive Authentication Attempts) and has a CVSS v3.1 score of 8.8, indicating high impact on confidentiality, integrity, and availability.
Potential Impact
An attacker on the adjacent network can perform unlimited password guessing attempts against the router's password change functionality without being locked out, potentially leading to full compromise of the device. This can result in complete loss of confidentiality, integrity, and availability of the router and its network traffic.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, network segmentation to restrict access to the router's management interfaces and monitoring for unusual password change attempts may help reduce risk. Avoid exposing the router management interface to untrusted networks.
CVE-2026-36607: n/a
Description
The Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 is vulnerable to unauthenticated brute-force attacks via its TDDP password change endpoint. This endpoint lacks rate limiting, unlike the login endpoint, allowing an attacker on the adjacent network to attempt unlimited password guesses without triggering account lockout. The vulnerability has a high severity with a CVSS score of 8.8.
CVSS v3.1
Score 8.8high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-36607 describes a vulnerability in the Mercusys AC12G (EU) V1 router firmware AC12G(EU)_V1_200909 where the TDDP password change endpoint (code=10) does not implement rate limiting. This allows unauthenticated attackers on the adjacent network to perform brute-force password attempts without account lockout, bypassing protections present on the login endpoint (code=7). The vulnerability is classified under CWE-307 (Improper Restriction of Excessive Authentication Attempts) and has a CVSS v3.1 score of 8.8, indicating high impact on confidentiality, integrity, and availability.
Potential Impact
An attacker on the adjacent network can perform unlimited password guessing attempts against the router's password change functionality without being locked out, potentially leading to full compromise of the device. This can result in complete loss of confidentiality, integrity, and availability of the router and its network traffic.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, network segmentation to restrict access to the router's management interfaces and monitoring for unusual password change attempts may help reduce risk. Avoid exposing the router management interface to untrusted networks.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-04-06T00:00:00.000Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a206578e29bf47b50d40fb6
Added to database: 06/03/2026, 17:33:44 UTC
Last enriched: 06/10/2026, 19:42:34 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 54
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