CVE-2021-31362 : Vulnerability Insights and Analysis
Discover the details of CVE-2021-31362 affecting Juniper Networks Junos OS and Junos OS Evolved. Learn about the impact, affected versions, and mitigation steps to prevent a Denial of Service (DoS) attack.
A Protection Mechanism Failure vulnerability in RPD (routing protocol daemon) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated attacker to cause established IS-IS adjacencies to go down by sending a spoofed hello PDU leading to a Denial of Service (DoS) condition.
Understanding CVE-2021-31362
This CVE describes a vulnerability in Juniper Networks Junos OS and Junos OS Evolved that could lead to a Denial of Service (DoS) attack.
What is CVE-2021-31362?
CVE-2021-31362 is a Protection Mechanism Failure vulnerability that affects Juniper Networks Junos OS and Junos OS Evolved. It allows an attacker to disrupt IS-IS adjacencies, leading to a DoS condition.
The Impact of CVE-2021-31362
The vulnerability could result in Denial of Service (DoS) conditions, causing established IS-IS adjacencies to go down, affecting the availability of the systems.
Technical Details of CVE-2021-31362
The vulnerability has a CVSS base score of 6.5 (Medium severity) with attack vector 'ADJACENT_NETWORK' and high availability impact.
Vulnerability Description
The flaw in RPD allows an unauthenticated adjacent attacker to disrupt IS-IS adjacencies, causing a DoS condition.
Affected Systems and Versions
Junos OS versions prior to 18.2R3-S8, 18.3 versions prior to 18.3R3-S5, and other versions mentioned in the description are affected.
Exploitation Mechanism
There are no known instances of malicious exploitation of this vulnerability according to Juniper SIRT.
Mitigation and Prevention
To address CVE-2021-31362, Juniper Networks has released updated software versions that resolve the issue.
Immediate Steps to Take
Update to the patched software versions provided by Juniper Networks to mitigate the vulnerability.
Long-Term Security Practices
Regularly update systems with the latest security patches and follow best security practices to prevent similar vulnerabilities.
Patching and Updates
Software releases including 18.2R3-S8, 18.3R3-S5, and subsequent releases resolve the issue for Junos OS. For Junos OS Evolved, updates starting from 20.4R2-EVO address the vulnerability.