This vulnerability involves insufficient entropy in session management within the Kylin Web Service component of affected Tenda devices. Specifically, the CWebSessionManager_ParseSession function improperly handles the SESSION argument, leading to weak randomness or predictability in session tokens or related cryptographic operations. The flaw affects multiple Tenda router models up to the 20260625 build. The attack vector is remote network access, but exploitation complexity is high, and no privileges or user interaction are required. The CVSS 4.0 base score is 6.3, indicating medium severity.

Successful exploitation could allow an attacker to predict or manipulate session tokens due to insufficient entropy, potentially undermining session integrity or authentication mechanisms. However, the complexity of the attack is high, and no direct privileges or user interaction are needed. There is no evidence of known exploits in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or workaround has been published. Until a patch is available, limit exposure by restricting remote access to the affected devices' management interfaces where possible.