CVE-2021-0266: Juniper Junos

Critical severity, CVSS 9.8. EPSS: 0.9% chance of exploitation in the next 30 days.

The use of multiple hard-coded cryptographic keys in cSRX Series software in Juniper Networks Junos OS allows an attacker to take control of any instance of a cSRX deployment through device management services. This issue affects: Juniper Networks Junos OS on cSRX Series: All versions prior to 20.2R3; 20.3 versions prior to 20.3R2; 20.4 versions prior to 20.4R2.

Affected products

• Juniper Junos: version 20.2 only; version 20.3 only; version 20.4 only

Published 2021-04-22. Last modified 2026-06-17.