CVE-2021-0253: Junos OS: NFX Series: Local Command Execution Vulnerability in JDMD Leads to Privilege Escalation
NFX Series devices using Juniper Networks Junos OS are susceptible to a local command execution vulnerability thereby allowing an attacker to elevate their privileges via the Junos Device Management Daemon (JDMD) process. This issue affects Juniper Networks Junos OS on NFX Series 17.2 version 17.2R1 and later versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R2-S5, 18.4R3-S5; 19.1 versions prior to 19.1R1-S3; 19.2 version 19.1R2 and later versions prior to 19.2R3; 19.3 versions prior to 19.3R3; 19.4 versions prior to 19.4R2-S2. 19.4 versions 19.4R3 and above. This issue does not affect Juniper Networks Junos OS versions prior to 17.2R1. This issue does not affect the JDMD as used by Junos Node Slicing such as External Servers use in conjunction with Junos Node Slicing and In-Chassis Junos Node Slicing on MX480, MX960, MX2008, MX2010, MX2020.
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Frequently Asked Questions
What is the severity of CVE-2021-0253?
CVE-2021-0253 is classified as a high severity vulnerability.
How do I fix CVE-2021-0253?
To fix CVE-2021-0253, upgrade Junos OS to the patched versions recommended by Juniper Networks.
Which devices are affected by CVE-2021-0253?
CVE-2021-0253 affects NFX Series devices running specific versions of Junos OS.
What types of attacks are possible with CVE-2021-0253?
An attacker could exploit CVE-2021-0253 to execute local commands and elevate privileges.
Is there a workaround for CVE-2021-0253?
Currently, the primary mitigation for CVE-2021-0253 is to apply the appropriate updates to Junos OS.