CVE-2021-21739

Name of the Vulnerable Software and Affected Versions ZTE ZXCTN 6120H version V5.10.00B24

Description A security issue exists in ZTE's transport network access layer product due to insufficient data reliability verification. This allows attackers to replace an authenticated optical module with an unauthenticated one, bypassing system authentication and detection, which affects signal transmission.

Recommendations For ZTE ZXCTN 6120H version V5.10.00B24, consider restricting access to the optical module replacement process until a fix is available to prevent unauthorized module swaps. At the moment, there is no information about a newer version that contains a fix for this vulnerability.