CVE-2026-18368
Received Received - Intake

Heap-based Buffer Overflow in Teltonika RUTOS Modbus TCP

Publication date: 2026-08-13

Last updated on: 2026-08-13

Assigner: Teltonika Networks

Description
In Teltonika Networks RUTOS devices, a vulnerability exists in modbusgwd due to improper handling of Modbus TCP request data. A remote, unauthenticated attacker with access to the affected service could trigger a heap-based buffer overflow, resulting in a denial of service.

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Meta Information

Published
2026-08-13
Last Modified
2026-08-13
Generated
2026-08-13
AI Q&A
2026-08-13
EPSS Evaluated
N/A
NVD
CVE-2026-18368
EUVD
EUVD-2026-57787

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
teltonika_networks modbusgwd *

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

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Executive Summary

This vulnerability is a heap-based buffer overflow in the modbusgwd component of Teltonika Networks RUTOS devices. It occurs due to improper handling of Modbus TCP request data, allowing a remote unauthenticated attacker with service access to trigger the overflow and cause a denial of service.

Detection Guidance

Detecting this vulnerability requires checking for the presence of the vulnerable modbusgwd service on Teltonika RUTOS devices. Use network scanning tools like nmap to identify devices running the service on port 502 (default Modbus TCP port). Command: nmap -p 502 --script modbus-discover <target_IP>

Impact Analysis

The vulnerability could allow an attacker to crash the affected device by sending specially crafted Modbus TCP requests, leading to service disruption and potential loss of network connectivity for devices relying on the modbusgwd service.

Compliance Impact

The vulnerability in Teltonika Networks RUTOS devices could lead to denial of service due to a heap-based buffer overflow in modbusgwd. This may disrupt network services, potentially affecting data availability and integrity. Compliance with GDPR or HIPAA could be impacted if the DoS disrupts systems handling personal or health data, but specific regulatory impacts depend on deployment context.

Mitigation Strategies

Immediately update the RUTOS firmware to the latest version provided by Teltonika Networks. If an update is unavailable, restrict network access to the Modbus TCP port (502) using firewall rules to prevent remote exploitation. Disable the modbusgwd service if not required.

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