CVE-2026-12495: CWE-121 Stack-based buffer overflow in Mercusys MB115-4G
Denial-of-service (DoS) vulnerability due to a stack buffer overflow in the http_gdpr_decrypt function of the Mercusys MB115-4G device's web interface. An unauthenticated attacker could exploit this vulnerability by sending a specially crafted request to the /cgi/login endpoint, causing memory corruption and the httpd process to crash, resulting in a denial of service for the web administration service.
AI Analysis
Technical Summary
CVE-2026-12495 is a stack-based buffer overflow vulnerability (CWE-121) in the Mercusys MB115-4G device's web interface, specifically in the http_gdpr_decrypt function. Exploitation requires no authentication and involves sending a specially crafted request to the /cgi/login endpoint. Successful exploitation causes memory corruption leading to the crash of the httpd process, resulting in denial of service for the device's web administration interface. The affected version is 1.7.0. There is currently no known patch or official fix available.
Potential Impact
Exploitation results in denial of service by crashing the httpd process, making the web administration interface unavailable. This could disrupt management and configuration of the affected device. No information indicates remote code execution or data disclosure impacts.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the device's web interface to trusted networks and monitor for unusual requests targeting the /cgi/login endpoint to reduce exposure.
CVE-2026-12495: CWE-121 Stack-based buffer overflow in Mercusys MB115-4G
Description
Denial-of-service (DoS) vulnerability due to a stack buffer overflow in the http_gdpr_decrypt function of the Mercusys MB115-4G device's web interface. An unauthenticated attacker could exploit this vulnerability by sending a specially crafted request to the /cgi/login endpoint, causing memory corruption and the httpd process to crash, resulting in a denial of service for the web administration service.
CVSS v4.0
Score 5.3medium
Affected software
Mercusys
MB115-4G
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-12495 is a stack-based buffer overflow vulnerability (CWE-121) in the Mercusys MB115-4G device's web interface, specifically in the http_gdpr_decrypt function. Exploitation requires no authentication and involves sending a specially crafted request to the /cgi/login endpoint. Successful exploitation causes memory corruption leading to the crash of the httpd process, resulting in denial of service for the device's web administration interface. The affected version is 1.7.0. There is currently no known patch or official fix available.
Potential Impact
Exploitation results in denial of service by crashing the httpd process, making the web administration interface unavailable. This could disrupt management and configuration of the affected device. No information indicates remote code execution or data disclosure impacts.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the device's web interface to trusted networks and monitor for unusual requests targeting the /cgi/login endpoint to reduce exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- INCIBE
- Date Reserved
- 2026-06-17T08:53:55.157Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a673f8d9c2644c7f8f0f035
Added to database: 07/27/2026, 11:22:53 UTC
Last enriched: 07/30/2026, 00:12:05 UTC
Last updated: 09/11/2026, 07:31:51 UTC
Views: 106
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