CVE-2021-0280 : What You Need to Know
Discover the impact, technical details, and mitigation strategies for CVE-2021-0280, an Improper Initialization vulnerability in Juniper Networks Junos OS affecting PTX platforms and QFX10K Series.
An Improper Initialization vulnerability in Juniper Networks Junos OS on PTX platforms and QFX10K Series may lead to the flapping of BFD sessions, impacting routing protocols and network stability.
Understanding CVE-2021-0280
This CVE describes a vulnerability in Juniper Networks Junos OS affecting PTX platforms and QFX10K Series, potentially causing Denial of Service (DoS) conditions.
What is CVE-2021-0280?
This CVE involves an Improper Initialization vulnerability in Junos OS, impacting specific platforms with Paradise (PE) chipset-based line cards. Changes in ddos-protection configuration may not take effect as expected, leading to potential DoS conditions.
The Impact of CVE-2021-0280
The vulnerability may result in the flapping of BFD sessions, affecting routing protocols and network stability, potentially causing a DoS condition due to sustained packet processing.
Technical Details of CVE-2021-0280
The vulnerability affects Junos OS versions prior to 17.4R3-S5, 18.2R3-S8, 18.3R3-S5, 18.4R2-S8, 19.1R3-S5, 19.2R3-S2, 19.3R3-S2, 19.4R3-S2, 20.1R3, 20.2R2-S3, 20.2R3, 20.3R2, 20.4R2. It has a CVSS base score of 7.5 (High).
Vulnerability Description
The issue arises from changes in ddos-protection configuration not taking effect as expected, potentially impacting BFD sessions and leading to a DoS condition.
Affected Systems and Versions
PTX Series and QFX10K Series platforms with Paradise (PE) chipset-based line cards running specific Junos OS versions are affected.
Exploitation Mechanism
No known malicious exploitation of this vulnerability has been reported by Juniper SIRT.
Mitigation and Prevention
Mitigate this issue by applying the provided software releases to affected systems to address the vulnerability.
Immediate Steps to Take
Update Junos OS to version 17.4R3-S5, 18.2R3-S8, 18.3R3-S5, 18.4R2-S8, 19.1R3-S5, 19.2R3-S2, 19.3R3-S2, 19.4R3-S2, 20.1R3, 20.2R2-S3, 20.2R3, 20.3R2, 20.4R2, or later.
Long-Term Security Practices
Ensure timely software updates and follow best practices for network security to prevent similar vulnerabilities.
Patching and Updates
Juniper Networks has released updated software versions to resolve this specific issue affecting Junos OS on PTX and QFX10K Series platforms.