CVE-2025-48733 Overview
CVE-2025-48733 affects the DuraComm SPM-500 DP-10iN-100-MU industrial power management device. The vulnerability stems from missing authentication [CWE-306] on a function that should require user authentication. An unauthenticated remote attacker can invoke the function to repeatedly reboot the device, producing a sustained denial of service against the affected industrial control system equipment.
Critical Impact
An unauthenticated attacker with network access can repeatedly reboot the SPM-500 DP-10iN-100-MU, disrupting availability of the device and any operational technology workflows that depend on it.
Affected Products
- DuraComm SPM-500 DP-10iN-100-MU
Discovery Timeline
- 2025-07-22 - CVE-2025-48733 published to the National Vulnerability Database
- 2025-07-22 - CISA published ICS Advisory ICSA-25-203-01 covering the issue
- 2026-04-15 - Last updated in the NVD database
Technical Details for CVE-2025-48733
Vulnerability Analysis
The DuraComm SPM-500 DP-10iN-100-MU exposes a device function over the network without verifying the identity of the caller. Because the function is reachable without credentials, any attacker who can connect to the device interface can invoke it. The function in question can trigger a device reboot. Repeated invocation forces the device into a continuous reboot loop, denying service to legitimate operators and downstream systems.
The weakness maps to Missing Authentication for Critical Function [CWE-306]. This class of flaw is common in embedded and industrial devices where management functions are exposed through web or proprietary interfaces without enforcing session or credential checks. The impact is limited to availability. Confidentiality and integrity of data on the device are not directly affected by this issue.
Root Cause
The root cause is the absence of access control on a function that should require an authenticated session. The device firmware does not validate that the requester holds a valid user session before executing the reboot action.
Attack Vector
Exploitation requires only network reachability to the device. No privileges, no user interaction, and no prior authentication are needed. An attacker sends requests to the unauthenticated endpoint in a loop to keep the device offline.
No verified public proof-of-concept code is available. See the CISA ICS Advisory ICSA-25-203-01 for vendor coordination details.
Detection Methods for CVE-2025-48733
Indicators of Compromise
- Unexpected and repeated reboot events recorded in SPM-500 device logs or syslog forwarders.
- Loss of availability or polling timeouts from SCADA and monitoring systems that query the device.
- Inbound network sessions to the device management interface from unknown or non-engineering source addresses.
Detection Strategies
- Monitor for repeated short uptime values on the SPM-500 DP-10iN-100-MU, which indicate a reboot loop.
- Alert on high-frequency requests to the device management interface from a single source within short time windows.
- Correlate device unreachability events with network flow records to identify the originating host.
Monitoring Recommendations
- Forward device logs and uptime telemetry to a central SIEM or data lake for baselining and anomaly detection.
- Apply network segmentation monitoring to flag any traffic to the device originating outside the engineering VLAN.
- Track ICMP and TCP availability of the device with sub-minute polling to detect outage patterns quickly.
How to Mitigate CVE-2025-48733
Immediate Actions Required
- Restrict network access to the SPM-500 DP-10iN-100-MU so that only authorized engineering workstations and jump hosts can reach its management interface.
- Place the device behind a properly configured firewall and disable any direct exposure to the internet, in line with CISA ICS guidance.
- Contact DuraComm through the DuraComm Contact Page to obtain remediation guidance and updated firmware availability.
Patch Information
No vendor patch identifier is listed in the NVD record at the time of writing. Operators should reference CISA ICS Advisory ICSA-25-203-01 and coordinate directly with DuraComm for firmware updates or configuration changes that introduce authentication on the affected function.
Workarounds
- Isolate the device on a dedicated OT network segment with strict allow-list ACLs at the perimeter.
- Require operators to access the device through a VPN or jump host with multi-factor authentication.
- Disable remote management interfaces when not actively in use and rely on local console access for routine maintenance.
- Monitor and rate-limit traffic to the device management port to slow brute reboot attempts while a fix is pending.
# Example: restrict access to the SPM-500 management interface to a single engineering workstation
# Replace 10.10.20.5 with the authorized host and 10.10.50.10 with the device address
iptables -A FORWARD -s 10.10.20.5 -d 10.10.50.10 -p tcp --dport 80 -j ACCEPT
iptables -A FORWARD -d 10.10.50.10 -p tcp --dport 80 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
