OVMS3 CVE-2026-37541: Critical Buffer Overflow Exposes EV Systems
The National Vulnerability Database has issued a critical advisory for CVE-2026-37541, a buffer overflow vulnerability impacting Open Vehicle Monitoring System 3 (OVMS3) version 3.3.005. This flaw, residing in the canformat_gvret.cpp component, stems from inadequate validation of the length field within GVRET binary data.
This oversight allows remote attackers to craft malicious GVRET frames. Such frames can trigger a denial-of-service condition, effectively disabling the OVMS3 system. More critically, the National Vulnerability Database indicates the vulnerability could also enable arbitrary code execution, granting attackers full control over affected systems.
Rated with a CVSS score of 10.0 (CRITICAL), this vulnerability poses a severe risk. While specific affected products beyond OVMS3 are not detailed, organizations utilizing OVMS3 in any capacity for vehicle monitoring or control systems are directly exposed. The potential for remote code execution on critical vehicle infrastructure demands immediate attention.
What This Means For You
- If your organization deploys Open Vehicle Monitoring System 3 (OVMS3), specifically version 3.3.005, you are exposed to a critical remote code execution vulnerability. This isn't just a DoS; it's a potential full compromise of vehicle monitoring systems. Identify all OVMS3 instances in your environment and prepare to patch immediately once an update is available. In the interim, isolate these systems from untrusted networks wherever possible.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-37541: OVMS3 GVRET Binary Data Buffer Overflow
title: CVE-2026-37541: OVMS3 GVRET Binary Data Buffer Overflow
id: scw-2026-05-01-ai-1
status: experimental
level: critical
description: |
This rule detects attempts to exploit CVE-2026-37541 by identifying requests to the '/gvret' endpoint with a 'length=' parameter in the query string, which is indicative of the vulnerable GVRET binary data processing in OVMS3. A successful exploitation could lead to remote code execution or denial of service.
author: SCW Feed Engine (AI-generated)
date: 2026-05-01
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-37541/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/gvret'
cs-uri-query|contains:
- 'length='
sc-status:
- 200
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-37541 | Buffer Overflow | Open Vehicle Monitoring System 3 (OVMS3) version 3.3.005 |
| CVE-2026-37541 | DoS | canformat_gvret.cpp - improper validation of length field in GVRET binary data |
| CVE-2026-37541 | RCE | canformat_gvret.cpp - improper validation of length field in GVRET binary data |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 01, 2026 at 20:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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