Is there a patch available for CVE-2026-12495?

Yes, a patch is available for CVE-2026-12495. Update the affected software to the latest version immediately.

Mb115 4G CVE-2026-12495

Q: What is the CVSS score of CVE-2026-12495?

CVE-2026-12495 has a CVSS 4.0 base score of 5.3 (Medium). CVSS vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.2%.

EUVD-2026-49144 MEDIUM

Stack-based Buffer Overflow (CWE-121)

2026-07-27 INCIBE

GHSA-f8cq-j6x7-pfpx

Buffer Overflow Denial Of Service Stack Overflow Mb115 4G Mercusys

5.3

CVSS 4.0 · Vendor: INCIBE

Severity by source

Vendor (INCIBE) PRIMARY

5.3 CRITICAL

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (INCIBE) · only source for this CVE.

CVSS VectorVendor: INCIBE

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

Severity Changed

Jul 28, 2026 - 08:22 NVD

CRITICAL MEDIUM

CVSS changed

Jul 28, 2026 - 08:22 NVD

9.2 (CRITICAL) 5.3 (MEDIUM)

Analysis Generated

Jul 27, 2026 - 11:46 vuln.today

CVE Published

Jul 27, 2026 - 10:32 cve.org

CRITICAL 9.2

DescriptionCVE.org

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.

AnalysisAI

Denial-of-service in the Mercusys MB115-4G router's web interface allows unauthenticated attackers to crash the administration service by sending a crafted request to the /cgi/login endpoint. A stack buffer overflow in the http_gdpr_decrypt function corrupts memory and halts the httpd process, leaving the device operational but unmanageable through the web UI. A vendor patch is available; no public exploit or active exploitation has been identified.