CVE-2021-0240 : What You Need to Know
Understand the impact of CVE-2021-0240 on Juniper Networks Junos OS. Learn about the vulnerability, affected systems, and mitigation steps to address the issue.
A detailed overview of CVE-2021-0240 affecting Junos OS by Juniper Networks.
Understanding CVE-2021-0240
This CVE involves the receipt of malformed DHCPv6 packets causing the jdhcpd process to crash and restart on Junos OS platforms.
What is CVE-2021-0240?
The issue impacts Juniper Networks Junos OS systems configured as DHCPv6 local server or DHCPv6 Relay Agent. It leads to a Denial of Service (DoS) condition due to a crash in the JDHCPD process when processing malformed DHCPv6 packets.
The Impact of CVE-2021-0240
The vulnerability results in a sustained DoS condition, affecting versions of Junos OS ranging from 17.3 to 20.4. However, DHCPv4 remains unaffected by this issue.
Technical Details of CVE-2021-0240
This section provides technical details of the vulnerability.
Vulnerability Description
The issue arises from the reception of malformed DHCPv6 packets, triggering a crash in the JDHCPD process and subsequent restarts.
Affected Systems and Versions
Junos OS versions impacted include 17.3 to 20.4 (specific releases noted in the Juniper Networks advisory).
Exploitation Mechanism
As of now, there have been no reported instances of malicious exploitation of this vulnerability according to Juniper SIRT.
Mitigation and Prevention
Learn how to address and prevent the CVE-2021-0240 vulnerability.
Immediate Steps to Take
Juniper Networks recommends updating affected systems to specific software releases. Check the Juniper Networks advisory for the detailed list of resolved versions.
Long-Term Security Practices
Regularly update Junos OS systems to the latest software releases to mitigate potential security risks.
Patching and Updates
Ensure all Juniper Networks Junos OS software is updated to versions resolving the CVE-2021-0240 vulnerability.