CVE-2026-22920: Weak Password Salting Vulnerability

CVE-2026-22920 Overview

CVE-2026-22920 is a cryptographic weakness affecting SICK industrial devices where passwords have not been adequately salted, making them vulnerable to password extraction attacks. This vulnerability falls under CWE-1391 (Use of Weak Credentials) and exposes device credentials to offline cracking attempts if an attacker gains access to the password storage mechanism.

Industrial control system (ICS) environments are particularly sensitive to credential-related vulnerabilities, as compromised authentication can lead to unauthorized device access and potential manipulation of industrial processes.

Critical Impact

Inadequate password salting allows attackers who obtain password hashes to conduct efficient offline dictionary or rainbow table attacks, potentially recovering plaintext credentials for affected SICK industrial devices.

Affected Products

• SICK industrial devices (specific models referenced in vendor advisory)
• Refer to SICK CSAF Advisory for complete affected product list

Discovery Timeline

• January 15, 2026 - CVE-2026-22920 published to NVD
• January 16, 2026 - Last updated in NVD database

Technical Details for CVE-2026-22920

Vulnerability Analysis

This vulnerability exists due to improper implementation of password storage mechanisms within SICK industrial devices. When passwords are stored without adequate salting, identical passwords produce identical hash values, significantly reducing the computational effort required for an attacker to recover credentials through offline attacks.

The attack requires network access and involves high complexity, as the attacker must first obtain the stored password hashes before attempting extraction. While the vulnerability scope is limited to confidentiality impact without affecting integrity or availability, successful exploitation could grant unauthorized access to device management interfaces.

Root Cause

The root cause stems from insufficient cryptographic practices in the password storage implementation. CWE-1391 (Use of Weak Credentials) describes scenarios where credential storage fails to employ proper salting—a critical defense mechanism that adds unique random data to each password before hashing. Without adequate salts, attackers can leverage precomputed hash tables (rainbow tables) or efficiently conduct parallel dictionary attacks against multiple user accounts simultaneously.

Attack Vector

The attack vector is network-based but requires high complexity to exploit successfully. An attacker would need to:

1. Gain access to the password storage mechanism (through another vulnerability, backup files, or physical access)
2. Extract the inadequately salted password hashes
3. Conduct offline password cracking using rainbow tables or dictionary attacks
4. Use recovered credentials to authenticate to the device

Due to the lack of proper salting, if multiple devices or users share the same password, the identical hash values make bulk password recovery significantly more efficient.

Detection Methods for CVE-2026-22920

Indicators of Compromise

• Unexpected authentication attempts from unknown network sources
• Multiple failed login attempts followed by successful authentication
• Unauthorized access to device configuration or management interfaces
• Evidence of credential database extraction or backup file access

Detection Strategies

• Monitor network traffic for unusual authentication patterns to SICK industrial devices
• Implement intrusion detection rules for anomalous access to device management interfaces
• Review authentication logs for signs of credential stuffing or dictionary attacks
• Audit access to configuration backup files that may contain password hashes

Monitoring Recommendations

• Deploy network segmentation to isolate ICS devices and monitor cross-segment traffic
• Enable comprehensive logging on SICK devices and forward logs to a centralized SIEM
• Implement network traffic analysis for industrial protocols accessing affected devices
• Follow CISA ICS Recommended Practices for monitoring industrial environments

How to Mitigate CVE-2026-22920

Immediate Actions Required

• Review the SICK CSAF Advisory for specific remediation guidance
• Change all passwords on affected devices to unique, complex values
• Implement network segmentation to limit access to affected devices
• Monitor for firmware updates from SICK that address this vulnerability
• Follow the SICK Cybersecurity Operating Guidelines

Patch Information

Consult the SICK PSIRT page for the latest security advisories and firmware updates addressing CVE-2026-22920. The vendor has published a CSAF advisory (SCA-2026-0001) with detailed remediation steps available in both JSON and PDF formats.

Workarounds

• Isolate affected SICK devices on dedicated network segments with strict access controls
• Implement additional authentication layers such as network-level access control lists
• Use strong, unique passwords for each device to mitigate the impact of inadequate salting
• Restrict management interface access to authorized personnel only via VPN or jump hosts
• Monitor for and respond to any suspicious authentication activity promptly

# Network segmentation example - isolate ICS devices
# Configure firewall rules to restrict access to SICK device management interfaces
# Allow only authorized management stations
iptables -A INPUT -s 192.168.100.0/24 -d 192.168.200.10 -p tcp --dport 443 -j ACCEPT
iptables -A INPUT -d 192.168.200.10 -p tcp --dport 443 -j DROP