CVE-2023-33778

CriticalCVSS 9.8

Published: 01/06/2023(UTC)Updated: 17/06/2026(UTC)Translated: 18/06/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.60%

44th percentile - higher than 44% of all known CVEs

Summary

Firmware versions of Draytek Vigor routers below 3.9.6/4.2.4, access points below v1.4.0, switches below 2.6.7, and Myvigor below 2.3.2 were found to use hardcoded encryption keys. This allows attackers to bind any affected device to their own account.

Risk Assessment

Attackers can create WCF and DrayDDNS licenses and synchronize them from the website, posing a serious security threat to the organization's network.

Recommendation

It is recommended to update the device firmware to the latest versions to eliminate hardcoded encryption keys and minimize risk.

Original NVD description (English source)

Draytek Vigor Routers firmware versions below 3.9.6/4.2.4, Access Points firmware versions below v1.4.0, Switches firmware versions below 2.6.7, and Myvigor firmware versions below 2.3.2 were discovered to use hardcoded encryption keys which allows attackers to bind any affected device to their own account. Attackers are then able to create WCF and DrayDDNS licenses and synchronize them from the website.