The vulnerability identified as CVE-2026-27754 affects the SODOLA SL902-SWTGW124AS network device firmware versions through 200.1.20, produced by Shenzhen Hongyavision Technology Co., Ltd. (Sodola Networks). The root cause is the use of the MD5 hash function for generating session cookies. MD5 is widely recognized as cryptographically broken due to its susceptibility to collision attacks, where two different inputs produce the same hash output. This weakness undermines the security of session tokens, which are critical for authenticating user sessions. Because session cookies are generated using MD5, attackers can predict or forge valid session tokens by exploiting MD5 collisions and token predictability. This allows them to bypass authentication controls and gain unauthorized access to the device's management interface or other protected functions. The vulnerability requires no privileges or user interaction and can be exploited remotely over the network. The CVSS 4.0 vector indicates an attack complexity that is low, no privileges required, no user interaction, and partial impact on confidentiality and integrity. Although no known exploits are currently in the wild and no patches have been released, the vulnerability poses a significant risk to the confidentiality and integrity of affected devices. The lack of patch availability necessitates immediate mitigation efforts by organizations relying on this device. The use of MD5 for security-sensitive functions is a known poor practice, and modern cryptographic standards recommend stronger hash functions such as SHA-256 or SHA-3. The device's firmware should be updated once a patch is available, or alternative mitigations should be applied to reduce exposure.

The primary impact of CVE-2026-27754 is unauthorized access to the SODOLA SL902-SWTGW124AS device due to session cookie forgery. This compromises the confidentiality and integrity of device management sessions, potentially allowing attackers to alter device configurations, intercept network traffic, or disrupt network operations. Organizations using these devices in critical network infrastructure could face service disruptions, data breaches, or lateral movement within their networks. The vulnerability's remote exploitability and lack of required authentication increase the risk of widespread attacks if exploited. Although no availability impact is directly indicated, unauthorized control of network devices can indirectly affect availability through misconfiguration or denial-of-service actions. The absence of known exploits in the wild currently limits immediate risk, but the vulnerability's nature makes it a likely target for future exploitation. The medium CVSS score reflects a moderate but significant threat, especially in environments where these devices are deployed at scale or in sensitive roles.

1. Monitor vendor communications closely for firmware updates or patches addressing this vulnerability and apply them promptly once available. 2. Until patches are released, restrict network access to the management interfaces of affected devices using network segmentation, firewalls, or access control lists to limit exposure to trusted administrators only. 3. Implement strong network-level authentication and encryption mechanisms such as VPNs or IPsec tunnels to protect management traffic from interception and replay attacks. 4. Regularly audit device configurations and session management logs for signs of unauthorized access or suspicious session token activity. 5. Consider replacing affected devices with alternatives that follow modern cryptographic standards if patching is delayed or unavailable. 6. Employ intrusion detection/prevention systems (IDS/IPS) tuned to detect anomalous session token usage or repeated failed authentication attempts. 7. Educate network administrators about the risks of weak cryptographic primitives and the importance of timely patching and secure configuration practices. These steps go beyond generic advice by focusing on network-level controls, monitoring, and proactive replacement strategies to mitigate risks in the absence of immediate patches.