CVE-2026-27519: Binardat Firmware Info Disclosure Flaw

CVE-2026-27519 Overview

CVE-2026-27519 is a cryptographic vulnerability affecting Binardat 10G08-0800GSM network switch firmware version V300SP10260209 and prior. The vulnerability stems from the use of the RC4 stream cipher with a hard-coded encryption key that is embedded directly in client-side JavaScript code. Because this key is static and publicly exposed in the browser-accessible JavaScript files, an attacker with network access can extract the key and decrypt any protected values, effectively defeating all confidentiality protections implemented by the device's web management interface.

Critical Impact

Attackers can extract the hard-coded RC4 key from client-side JavaScript and decrypt sensitive configuration data, credentials, and other protected values transmitted by the network switch management interface.

Affected Products

• Binardat 10G08-0800GSM Firmware (version V300SP10260209 and prior)
• Binardat 10G08-0800GSM Hardware

Discovery Timeline

• 2026-02-24 - CVE-2026-27519 published to NVD
• 2026-02-25 - Last updated in NVD database

Technical Details for CVE-2026-27519

Vulnerability Analysis

This vulnerability represents a fundamental cryptographic design flaw classified under CWE-321 (Use of Hard-coded Cryptographic Key). The Binardat 10G08-0800GSM network switch implements RC4 encryption for protecting sensitive data transmitted through its web management interface. However, the implementation fatally embeds the encryption key directly within client-side JavaScript files that are served to any user accessing the device's web interface.

RC4, while historically popular due to its simplicity and speed, has been deprecated for secure communications due to known weaknesses. The use of a hard-coded key compounds this issue dramatically—the key cannot be changed by administrators and is identical across all affected devices. This means that once the key is extracted from a single device, it can be used to compromise any Binardat 10G08-0800GSM switch running vulnerable firmware versions.

The network-accessible nature of this vulnerability allows remote attackers to exploit it without requiring prior authentication, as the JavaScript files containing the key are typically served before authentication occurs.

Root Cause

The root cause of CVE-2026-27519 is the use of a hard-coded cryptographic key (CWE-321) embedded in client-side JavaScript code. This design decision violates fundamental cryptographic principles that require encryption keys to be:

1. Secret - Keys must never be exposed to untrusted parties
2. Unique - Each deployment should use distinct keys
3. Changeable - Keys should be rotatable without firmware updates

By embedding the RC4 key in browser-accessible JavaScript, the developers made the key inherently public to anyone who can access the device's web interface.

Attack Vector

The attack vector for this vulnerability is network-based and requires no prior authentication. An attacker can exploit this vulnerability through the following approach:

1. Access the network switch's web management interface
2. Retrieve the JavaScript files served by the device
3. Extract the hard-coded RC4 key from the JavaScript source code
4. Intercept encrypted traffic between legitimate users and the switch
5. Use the extracted key to decrypt protected values, potentially including administrative credentials, configuration data, and other sensitive information

The vulnerability can be exploited by any attacker with network visibility to the management interface, whether on the local network or through exposed management ports.

Detection Methods for CVE-2026-27519

Indicators of Compromise

• Unusual access patterns to JavaScript files on the switch management interface
• Network traffic analysis revealing encrypted payloads being captured and stored
• Evidence of credential theft or unauthorized configuration changes
• Presence of network sniffing tools targeting the switch's management subnet

Detection Strategies

• Monitor network traffic for suspicious access to the switch's web management interface from unauthorized sources
• Implement network segmentation monitoring to detect unauthorized access attempts to management VLANs
• Review access logs on the switch for unusual patterns of JavaScript file requests
• Deploy network intrusion detection systems to identify potential decryption attempts or replay attacks

Monitoring Recommendations

• Implement strict network access controls and monitor all connections to management interfaces
• Enable logging on the affected switches and forward logs to a centralized SIEM for correlation analysis
• Monitor for firmware updates from Binardat and apply patches when available
• Conduct periodic security assessments to identify exposed management interfaces

How to Mitigate CVE-2026-27519

Immediate Actions Required

• Restrict network access to the switch management interface using firewall rules and VLAN segmentation
• Disable web-based management if not required and use alternative management methods
• Implement additional encryption layers (such as VPN tunnels) for management traffic
• Monitor for any signs of credential compromise and rotate administrative credentials

Patch Information

At the time of publication, no vendor patch has been confirmed. Organizations should monitor the Binardat 10G Switch Product Page for firmware updates. Additional technical details are available in the VulnCheck Advisory on Binardat Switch.

Workarounds

• Isolate affected switches on a dedicated management network with strict access controls
• Use out-of-band management networks that are not accessible from production environments
• Implement network-level encryption (IPsec, VPN) for all traffic to and from management interfaces
• Consider replacing affected devices with switches that implement proper cryptographic key management

# Example: Restrict management interface access via firewall rules
# Allow only trusted management hosts to access switch web interface
iptables -A INPUT -p tcp --dport 443 -s 10.0.100.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP

# Alternative: Place management interface in isolated VLAN
# Configure upstream switch to restrict VLAN access