CVE-2025-15683 Overview
CVE-2025-15683 affects TBEA TLogger V2.1.0.0B0.0.0.0, a data-logging device used in industrial and energy environments. The web server contains multiple unauthenticated denial-of-service and stack-based buffer overflow vulnerabilities [CWE-121]. Remote attackers can invoke specific HTTP endpoints to reboot or reset the device, clear application data, or crash the web server through a segmentation fault. Several action endpoints process attacker-controlled parameters using unsafe sprintf() and strcat() operations without bounds checking, enabling crafted input to trigger buffer overflows.
Critical Impact
Unauthenticated remote attackers can reboot the device, wipe application data, or crash the web server through crafted HTTP requests against exposed action endpoints.
Affected Products
- TBEA TLogger V2.1.0.0B0.0.0.0
- TBEA TLogger V2 web server component
- Deployments exposing the TLogger management interface to untrusted networks
Discovery Timeline
- 2026-08-10 - CVE-2025-15683 published to NVD
- 2026-08-12 - Last updated in NVD database
Technical Details for CVE-2025-15683
Vulnerability Analysis
CVE-2025-15683 covers a set of related weaknesses in the TLogger V2 web server. The most severe class involves stack-based buffer overflows [CWE-121] reachable through unauthenticated HTTP requests. Multiple action endpoints copy attacker-supplied query or body parameters into fixed-size stack buffers using sprintf() and strcat() without validating input length. Oversized input overwrites the stack frame and crashes the server.
A second class of issues consists of unauthenticated logic endpoints that perform destructive actions. Endpoints such as onRestart, onReset, and ClearData reboot the device, factory-reset it, or delete stored application data when invoked. Because these endpoints do not require authentication, any network-reachable attacker can trigger them repeatedly.
The combined effect is a durable denial-of-service condition against the logger and its collected data. Successful exploitation disrupts telemetry collection and can force operator intervention to restore service.
Root Cause
The root cause is missing authentication on state-changing action handlers, combined with unsafe string handling in parameter parsing. The web server relies on unbounded C string primitives and trusts caller-supplied length and format assumptions.
Attack Vector
Exploitation requires network access to the TLogger web interface. An attacker sends crafted HTTP requests to affected endpoints, including onRestart, onReset, ClearData, uploadInvFile, getIndiaRPData, YearCaparity, TotalfaultData, recordData, InvHistoryData, CollectHistoryData, InvFaultData, GetPortTableByParm, and UpdatePortConfig. No credentials or user interaction are required.
No verified public proof-of-concept code is available. See the TBEA vendor site for product information and vendor contact details.
Detection Methods for CVE-2025-15683
Indicators of Compromise
- Unexpected reboots or factory resets of TLogger V2 devices without administrator action.
- Loss of historical logging data following inbound HTTP traffic from external sources.
- Web server process crashes and segmentation fault entries in device logs.
- HTTP request logs referencing endpoints such as onRestart, onReset, ClearData, GetPortTableByParm, or UpdatePortConfig from unauthenticated sources.
Detection Strategies
- Monitor network traffic to TLogger management interfaces for requests targeting the listed action endpoints.
- Alert on HTTP requests to TLogger devices containing oversized query string or POST body parameters.
- Correlate device reboot events with preceding inbound HTTP traffic to identify triggered denial-of-service attempts.
Monitoring Recommendations
- Forward TLogger and upstream firewall logs to a centralized SIEM for retention and correlation.
- Track availability metrics for TLogger devices to detect repeated crash or reset patterns.
- Baseline expected management traffic and alert on connections from unauthorized source addresses.
How to Mitigate CVE-2025-15683
Immediate Actions Required
- Remove TLogger V2 devices from direct internet exposure and restrict management access to trusted operator networks.
- Place TLogger devices behind a firewall or VPN and block untrusted access to the web server port.
- Contact TBEA support to confirm whether a firmware update addressing these endpoints is available.
- Increase monitoring of TLogger devices for unexpected reboots, resets, or data loss.
Patch Information
No vendor patch or fixed firmware version is referenced in the published advisory data at this time. Operators should engage TBEA directly through the TBEA corporate site to obtain guidance and firmware updates.
Workarounds
- Enforce network segmentation so TLogger devices reside on isolated OT or management VLANs.
- Apply firewall access control lists that permit HTTP access only from designated operator workstations.
- Deploy a reverse proxy that terminates client sessions, enforces authentication, and blocks requests to the affected endpoints.
- Rate-limit inbound HTTP requests to reduce the effectiveness of repeated crash or reset attempts.
# Example iptables rule restricting TLogger web access to a trusted management subnet
iptables -A INPUT -p tcp --dport 80 -s 10.10.20.0/24 -d <tlogger_ip> -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -d <tlogger_ip> -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
