CVE-2026-27754 in SODOLA SL902-SWTGW124AS
Summary
by MITRE • 02/27/2026
SODOLA SL902-SWTGW124AS firmware versions through 200.1.20 use the cryptographically broken MD5 hash function for session cookie generation, weakening session security. Attackers can exploit predictable session tokens combined with MD5's collision vulnerabilities to forge valid session cookies and gain unauthorized access to the device.
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Analysis
by VulDB Data Team • 03/05/2026
The vulnerability identified as CVE-2026-27754 affects the SODOLA SL902-SWTGW124AS device firmware versions up to 200.1.20 where the system employs the cryptographically broken MD5 hash function for generating session cookies. This weakness fundamentally compromises the security of user sessions by relying on an algorithm that has been widely deprecated due to its inherent cryptographic vulnerabilities. The MD5 algorithm, once considered acceptable for certain applications, has been thoroughly demonstrated to be unsuitable for security-sensitive contexts such as session management, as it is susceptible to both collision attacks and preimage attacks that allow adversaries to manipulate or predict hash outputs.
The technical flaw manifests in the predictable nature of session tokens generated through MD5 hashing, which creates a significant attack surface for malicious actors. When session identifiers are generated using MD5, the algorithm's mathematical properties allow attackers to potentially compute equivalent hash values without knowing the original input data, enabling them to forge session cookies that will be accepted by the device's authentication system. This vulnerability directly maps to CWE-327, which specifically addresses the use of weak cryptographic algorithms, and aligns with ATT&CK technique T1566.001 for initial access through credential harvesting. The predictable session tokens combined with MD5's collision vulnerabilities create a pathway for attackers to bypass authentication mechanisms entirely, as they can generate valid session cookies that will be accepted by the device without proper authorization.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential complete system compromise. An attacker who successfully exploits this vulnerability could gain full administrative control over the device, allowing them to modify network configurations, access sensitive data, install malicious software, or use the device as a pivot point for attacking other systems within the network. The attack surface is particularly concerning given that the device appears to be a network gateway or router, which typically serves as a critical entry point for network traffic and often contains sensitive information or serves as a bridge between internal and external networks. This vulnerability could enable attackers to establish persistent access to the network, potentially leading to data exfiltration, lateral movement, or the deployment of additional malicious infrastructure.
Mitigation strategies for this vulnerability must address both the immediate cryptographic weakness and broader security considerations. The primary recommendation involves upgrading to firmware versions that utilize strong cryptographic algorithms such as SHA-256 or SHA-3 for session cookie generation, eliminating the reliance on MD5 entirely. Organizations should also implement additional security measures including but not limited to session timeout mechanisms, secure session storage practices, and network segmentation to limit the potential impact of any successful exploitation attempts. The implementation of proper session management protocols, including the use of cryptographically secure random number generators for session token creation, would significantly reduce the risk of predictable session identifiers. Additionally, network monitoring systems should be configured to detect unusual authentication patterns or unauthorized access attempts that might indicate exploitation of this vulnerability. Security teams should also consider implementing multi-factor authentication mechanisms where possible, as this would provide additional protection layers beyond the compromised session management system. Regular firmware updates and security assessments are essential to prevent similar vulnerabilities from being introduced in future versions of the device software.