Mercusys MW302R up to 1.4.10 Administrative Web Interface stack-based overflow

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Mercusys MW302R up to 1.4.10. This issue affects some unknown processing of the component Administrative Web Interface. The manipulation leads to stack-based overflow. This vulnerability is referenced as CVE-2026-31267. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Mercusys MW302R up to 1.4.10. It has been rated as problematic. This issue affects an unknown functionality of the component Administrative Web Interface. The manipulation with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is availability. The summary by CVE is:

Mercusys MW302R MW302R(EU)_V1_1.4.10 Build 231023 is vulnerable to Buffer Overflow in the administrative web interface. A stack buffer overflow vulnerability in the administrative web interface allows an authenticated attacker with administrative privileges to trigger a system crash by sending a specially crafted request. The vulnerability results in denial of service through control flow manipulation to an arbitrary instruction address.

It is possible to read the advisory at barry-dev.xyz. The identification of this vulnerability is CVE-2026-31267 since 03/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. The exploitation requires an enhanced level of successful authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/09/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Mercusys

Name

• MW302R

Version

• 1.4.0
• 1.4.1
• 1.4.2
• 1.4.3
• 1.4.4
• 1.4.5
• 1.4.6
• 1.4.7
• 1.4.8
• 1.4.9
• 1.4.10

CPE 2.3info

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CPE 2.2info

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