CVE-2025-11779

Critical

Published: 02 December 2025

Published

02 December 2025

Modified

03 December 2025

KEV Added

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Patch

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CVSS Score 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0124 79.5th percentile

Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-11779 is a critical-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Circutor Sge-Plc1000 Firmware. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 20.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-16 (Memory Protection).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190). What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-10 Information Input Validation good match

prevent

SI-10 requires validation of information inputs at defined points, directly preventing unsanitized parameters in the 'SetLan' function from causing buffer overflow or command injection via 'index.cgi' web requests.

SI-16 Memory Protection good match

prevent

SI-16 implements memory protections that safeguard against stack-based buffer overflows like the one in the 'SetLan' function, blocking unauthorized code execution from crafted inputs.

SI-2 Flaw Remediation good match

prevent

SI-2 mandates identification, reporting, testing, and deployment of fixes for system flaws, directly addressing this specific buffer overflow vulnerability through patching.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

Why these techniques?

Stack-based buffer overflow with command injection in public-facing web application (index.cgi) on network-exposed devices, enabling remote unauthenticated arbitrary command execution.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

NVD Description

Stack-based buffer overflow vulnerability in CircutorSGE-PLC1000/SGE-PLC50 v9.0.2. The 'SetLan' function is invoked when a new configuration is applied. This new configuration function is activated by a management web request, which can be invoked by a user when making changes to…

the 'index.cgi' web application. The parameters are not being sanitised, which could lead to command injection.

Deeper analysisAI

CVE-2025-11779 is a stack-based buffer overflow vulnerability (CWE-121) in Circutor SGE-PLC1000 and SGE-PLC50 devices running version 9.0.2. The issue affects the 'SetLan' function, which is invoked during the application of new configurations triggered by management web requests to the 'index.cgi' web application. Parameters passed to this function are not sanitized, which could enable command injection.

The vulnerability has a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating it is exploitable remotely over the network by unauthenticated attackers with low complexity and no user interaction required. An attacker could send a crafted request to the 'index.cgi' endpoint to trigger the vulnerable 'SetLan' function, resulting in stack buffer overflow and potential arbitrary command execution, compromising confidentiality, integrity, and availability with high impact.

Mitigation details are available in the INCIBE-CERT advisory on multiple vulnerabilities in Circutor products, accessible at https://www.incibe.es/en/incibe-cert/notices/aviso-sci/multiple-vulnerabilities-circutor-products-0.