Full Report
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Tuesday warned of active exploitation of a critical security flaw impacting Lantronix EDS5000 Series devices, urging Federal Civilian Executive Branch (FCEB) agencies to apply the fixes by June 26, 2026. The vulnerability in question is CVE-2025-67038 (CVSS score: 9.8), a code injection flaw that could result in the execution
Analysis Summary
# Vulnerability: Critical Code Injection in Lantronix EDS5000 Series
## CVE Details
- **CVE ID:** CVE-2025-67038
- **CVSS Score:** 9.8 (Critical)
- **CWE:** CWE-94 (Improper Control of Generation of Code / Code Injection)
## Affected Systems
- **Products:** Lantronix EDS5000 Series (including EDS5008, EDS5016, EDS5032)
- **Versions:** Specific firmware versions prior to the June 2026 patches (related to the BRIDGE:BREAK disclosure).
- **Configurations:** Systems running the HTTP RPC module.
## Vulnerability Description
The vulnerability exists within the HTTP RPC module, which is responsible for executing shell commands to write logs following failed authentication attempts. The system fails to sanitize the username input before concatenating it into a shell command. An attacker can provide a specially crafted username containing OS command separators, leading to arbitrary command execution with root-level privileges.
## Exploitation
- **Status:** Exploited in the wild (Confirmed by CISA).
- **Complexity:** Low (Simple concatenation of unsanitized strings).
- **Attack Vector:** Network (Remote).
## Impact
- **Confidentiality:** High (Full system access/root privileges).
- **Integrity:** High (Ability to modify system files and configurations).
- **Availability:** High (Ability to disrupt services or brick the device).
## Remediation
### Patches
- **Lantronix Firmware Update:** Users must apply the latest firmware updates released for the EDS5000 series. CISA has mandated that FCEB agencies apply these fixes by June 26, 2026.
### Workarounds
- **Network Segmentation:** Ensure serial-to-IP converters are not exposed directly to the public internet.
- **Disable HTTP RPC:** If the module is not required for operational purposes, disable it to close the attack vector.
- **Access Control:** Restrict access to the device management interface to trusted internal IP addresses only.
## Detection
- **Indicators of Compromise:** Look for unusual entries in the system logs that contain shell metacharacters (e.g., `;`, `&`, `|`, `` ` ``, `$()`) within the username field of failed login attempts.
- **Detection Methods:** Monitor for unauthorized outbound network traffic originating from the device, which may indicate a reverse shell or malware deployment.
## References
- **CISA KEV Catalog:** hxxps[://]www[.]cisa[.]gov/known-exploited-vulnerabilities-catalog
- **Vendor Advisory:** hxxps[://]ltrxdev[.]atlassian[.]net/wiki/spaces/LTRXTS/pages/2538438657/Latest+Firmware+for+the+EDS5000+series+EDS5008+EDS5016+EDS5032
- **Forescout BRIDGE:BREAK Research:** hxxps[://]thehackernews[.]com/2026/04/22-bridgebreak-flaws-expose-20000[.]html