CVE-2025-67038 — Lantronix EDS5000: Code Injection | CVSS 9.8 CRITICAL

CRITICAL

CVSS 9.8 CRITICAL  ·  EPSS 0%  ·  Lantronix EDS5000

Severity Overview

Summary

An issue was discovered in Lantronix EDS5000 2.1.0.0R3. The HTTP RPC module executes a shell command to write logs when user's authantication fails. The username is directly concatenated with the command without any sanitization. This allow attackers to inject arbitrary OS commands into the username parameter. Injected commands are executed with root privileges.

What the Attack Looks Like

How it works: Attacker-controlled data is interpreted as executable code by the application’s runtime, enabling arbitrary code execution within the application’s security context.

If successfully exploited: A successful exploit gives the attacker a foothold on the target system with access to sensitive data and the ability to deploy secondary payloads. Full confidentiality and integrity impact means an attacker can both read and modify sensitive data — useful for credential harvesting, data theft, or manipulating application state. High availability impact means the vulnerability can also cause a denial of service, which may be used for disruption or as a diversion during a broader attack. The lateral movement potential mapped to T1210 means an attacker who gains initial access through this CVE may be able to spread to adjacent systems before detection.

Analyst Takeaway

The attack is launched over the network (remotely exploitable without physical access) and no authentication is required. This vulnerability is already in CISA KEV, which means exploitation has been confirmed in the wild — treat this as active risk, not theoretical exposure. The CVSS score places this in critical territory, so internet-facing systems and high-value assets should be prioritized for immediate remediation or compensating controls. The ATT&CK mapping suggests public-facing exploitation risk, so external exposure validation should be part of immediate triage. Because the mapping suggests remote service exploitation potential, defenders should also consider post-compromise lateral movement scenarios during investigation. In parallel with patching, defenders should review external exposure, hunt for signs of exploitation, and validate whether compensating controls are in place for vulnerable assets.

MITRE ATT&CK Mapping

• T1210 – Exploitation of Remote Services
  Rationale: The vulnerability context suggests exploitation of services commonly used for remote access or lateral movement.
• T1190 – Exploit Public-Facing Application
  Rationale: The product appears likely to be internet-facing or commonly exposed in enterprise environments.

Detection Guidance

• CWE-94 — Code Injection
  • Application logs: Look for code syntax in user-controlled fields — language-specific markers such as PHP tags (<?php), Python exec( / eval(, JavaScript Function(, template injection markers (e.g., {{7*7}}, ${7*7}).
  • Process execution: Code injection frequently results in the application process spawning unexpected child processes. Hunt for interpreter processes (python, php, node, ruby) spawned from unexpected parents.
  • Template injection: Server-side template injection often leaves arithmetic test results in response bodies during reconnaissance. WAF logs that capture response content can reveal this.
• T1210 — Exploitation of Remote Services
  • Monitor SMB, RDP, WinRM, SSH, and RPC activity between internal systems for patterns outside your normal management baseline.
  • Look for authentication bursts: repeated failures (Event ID 4625) from the same source followed by a successful logon (Event ID 4624).
  • Investigate remote execution behavior and lateral movement artifacts (PsExec, WMI remote execution, remote scheduled task creation) originating from recently exposed assets.
• T1190 — Exploit Public-Facing Application
  • Inspect web server, reverse proxy, load balancer, and WAF logs for abnormal request patterns — unusual URIs, oversized payloads, HTTP verb abuse, or encoding anomalies.
  • Monitor for spikes in HTTP 4xx/5xx responses that may indicate probing or failed exploitation attempts preceding a successful hit.
  • Review outbound connections from affected servers for unexpected command-and-control callbacks or secondary payload retrieval to external IPs.
  • Validate which internet-facing assets are running the vulnerable version and verify whether compensating controls (WAF rules, network ACLs) are in place and effective.

Hunting Considerations

These are proactive hunts mapped to the ATT&CK techniques identified for this CVE. Run them now — do not wait for an alert to fire.

• T1210 — Exploitation of Remote Services
  • Authentication burst pattern: Hunt for Event ID 4625 (failed logon) followed quickly by Event ID 4624 (successful logon) from the same source IP. This burst — repeated failures then success — is a classic exploitation indicator. Flag unusual Logon Type values: Type 3 (network), Type 10 (RemoteInteractive).
  • Unexpected east-west traffic: Look for new SMB (445), RDP (3389), WinRM (5985/5986), or SSH (22) connections between internal hosts that do not follow normal patterns — especially from workstations to servers or from servers outside your known management tooling.
  • Lateral movement artifacts: Hunt for PsExec service entries (Event ID 7045 with service name “PSEXESVC”), WMI remote execution (wmiprvse.exe spawning child processes), and scheduled tasks created via remote sessions (Event ID 4698).
  • Segmentation gaps: Confirm which affected hosts have network paths to domain controllers, file servers, or databases. Remote service exploitation is substantially more dangerous when segmentation is absent — validate this before concluding triage.
  • Unusual ports: Some exploitation of remote services uses non-standard ports. Cross-reference all new internal connections against your expected service port baseline to catch off-port lateral movement.
• T1190 — Exploit Public-Facing Application
  • Web/app server logs: Search for unusual HTTP methods, requests to non-standard paths, oversized payloads, or encoding anomalies (URL-encoded or double-encoded sequences) targeting the vulnerable application. Cluster by source IP and look for low-volume probing patterns before any successful hit.
  • Process telemetry: Hunt for child processes spawned by the web server or application process (e.g., apache2, nginx, w3wp.exe, java). Web server processes should not be launching shells, scripting engines (PowerShell, bash, python), or download utilities.
  • Outbound connections from the server: Alert on unexpected outbound HTTP/S or DNS from the application server to external IPs not in your CDN or update allowlist — this is a common secondary payload retrieval indicator post-exploitation.
  • File system writes: Look for new files written to web root directories, temp folders, or cron directories by the application process — especially scripts or executables placed there after an unusual inbound request.
  • Internal pivot follow-on: After gaining a foothold, attackers move laterally. Search for new internal connections originating from the compromised server in the hour following any suspicious external request.

Recommended Actions

Immediate (0–24 Hours)

• Inventory: Identify all systems running Lantronix EDS5000. Include production, staging, dev, and cloud environments — untracked instances are the most likely to remain unpatched.
• Validate internet-facing exposure: Determine which of the affected systems are reachable from the public internet. Prioritize these for immediate remediation or compensating controls.
• Apply compensating controls now: For systems that cannot be patched immediately, implement temporary mitigations: restrict access via firewall rules or ACLs, add WAF rules if applicable, disable or isolate the vulnerable component if feasible without breaking critical operations.

Remediation

• Apply the vendor patch: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
• CISA directive deadline: 2026-06-26 — this is the mandatory deadline for US federal civilian agencies under BOD 22-01. All organizations should treat this date as a strong target regardless of federal mandate.
• Verify remediation: After patching, confirm the correct version is installed on all affected hosts. Run a vulnerability scan or use your asset management tooling to verify — do not rely solely on change tickets.
• Post-patch compromise assessment: Privilege escalation and lateral movement techniques can result in persistent access that survives patching. After remediation, review the hunting considerations in this alert to assess whether compromise occurred before the patch was applied.

Detection Coverage

• Verify ATT&CK coverage: Confirm your SIEM and EDR have detection logic in place for T1210, T1190. Review the Detection Guidance and Hunting Considerations sections of this alert for the specific log sources and behavioral patterns to monitor.
• Unauthenticated exploitation monitoring: Because this vulnerability requires no authentication, internet-facing scanning and exploitation attempts may begin within hours of public disclosure. Ensure alerting is in place before the end of the day.
• Threat intelligence feeds: Monitor your TI feeds and vendor advisory channels for published indicators of compromise (IOCs), proof-of-concept exploit releases, or active campaign reporting associated with this CVE — these should trigger an immediate hunt even if no internal alerts have fired.

Detection Playbooks

Vulnerability Details

Additional Notes

https://ltrxdev.atlassian.net/wiki/spaces/LTRXTS/pages/2538438657/Latest+Firmware+for+the+EDS5000+series+EDS5008+EDS5016+EDS5032 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2025-67038