CVE-2025-55049: Default Cryptographic Key Vulnerability

CVE-2025-55049 Overview

CVE-2025-55049 is a critical cryptographic vulnerability involving the use of default cryptographic keys (CWE-1394). This vulnerability occurs when systems or applications ship with hardcoded or default cryptographic keys that are not unique to each deployment. Attackers who discover these default keys can decrypt sensitive communications, forge authentication tokens, or bypass security controls entirely without requiring any authentication.

Critical Impact

Attackers can compromise confidentiality and integrity of encrypted data by exploiting predictable default cryptographic keys, enabling unauthorized access to sensitive information and the ability to tamper with protected communications.

Affected Products

• Product information not yet disclosed in NVD data
• Refer to the Israeli Government CVE Advisories for specific affected systems

Discovery Timeline

• September 9, 2025 - CVE-2025-55049 published to NVD
• September 11, 2025 - Last updated in NVD database

Technical Details for CVE-2025-55049

Vulnerability Analysis

This vulnerability falls under CWE-1394 (Use of Default Cryptographic Key), a configuration weakness where cryptographic operations rely on keys that are identical across multiple deployments or installations. The network-accessible nature of this vulnerability means that remote attackers can exploit it without requiring any authentication or user interaction.

The vulnerability enables attacks against both confidentiality and integrity of protected data. An attacker with knowledge of the default key can decrypt encrypted communications, access protected secrets, or generate valid cryptographic signatures. This is particularly dangerous in scenarios involving authentication tokens, session management, or encrypted data storage.

Root Cause

The root cause is the implementation of hardcoded or default cryptographic keys within the affected system. This typically occurs when developers embed keys directly in source code, configuration files, or firmware for convenience during development, and these keys are not replaced with unique, randomly-generated keys before deployment. Such practices violate cryptographic best practices which require unique, securely-generated keys for each deployment.

Attack Vector

The attack vector is network-based, allowing remote exploitation. An attacker can leverage this vulnerability by:

1. Identifying the target system and obtaining the default cryptographic key through documentation, reverse engineering, or public disclosures
2. Intercepting encrypted network traffic or accessing encrypted stored data
3. Using the default key to decrypt sensitive information or forge cryptographic signatures
4. Gaining unauthorized access to protected resources or impersonating legitimate users

The vulnerability requires low attack complexity and no privileges or user interaction, making it highly exploitable once the default key is known. An attacker can passively decrypt communications or actively forge authentication credentials depending on how the cryptographic key is used.

Detection Methods for CVE-2025-55049

Indicators of Compromise

• Unexpected successful authentication or access from unknown sources using valid cryptographic credentials
• Decrypted data appearing in network captures when encryption should be in place
• Authentication tokens or signatures being accepted from systems that should not possess the cryptographic key
• Log entries showing access to protected resources from unusual IP addresses or at unusual times

Detection Strategies

• Audit configuration files and source code for hardcoded cryptographic keys or default key values
• Implement cryptographic key validation during deployment to ensure unique keys are configured
• Monitor for network traffic patterns that suggest an attacker is testing known default keys
• Use security scanning tools capable of detecting CWE-1394 vulnerabilities in codebases and configurations

Monitoring Recommendations

• Enable detailed logging for all cryptographic operations and authentication events
• Implement anomaly detection for authentication patterns that may indicate key compromise
• Monitor for unauthorized access attempts to encrypted data stores or communication channels
• Set up alerts for failed key validation or unexpected cryptographic operation failures

How to Mitigate CVE-2025-55049

Immediate Actions Required

• Identify all deployments using default cryptographic keys and prioritize them for remediation
• Generate new, unique cryptographic keys using a cryptographically secure random number generator for each deployment
• Replace default keys with the newly generated keys and verify proper functionality
• Rotate any credentials or tokens that may have been generated using the compromised default key

Patch Information

Specific patch details have not been published to the NVD at this time. Refer to the Israeli Government CVE Advisories for vendor-specific guidance and patch availability.

Organizations should contact the affected product vendor directly for official remediation guidance and security updates.

Workarounds

• Generate and configure unique cryptographic keys immediately, even before official patches are available
• Implement network segmentation to limit exposure of systems using default keys until remediation is complete
• Enable additional authentication layers to reduce reliance solely on cryptographic key validation
• Consider temporarily disabling network access to affected systems if they contain highly sensitive data

# Example: Generate a secure random key (adapt to your environment)
# For OpenSSL-based key generation
openssl rand -base64 32 > /path/to/secure/keyfile.key
chmod 600 /path/to/secure/keyfile.key

# Verify key uniqueness in your configuration
grep -r "DEFAULT_KEY" /etc/application/ || echo "No default keys found"