CVE-2024-21603: Junos OS: MX Series: Gathering statistics in a scaled SCU/DCU configuration will lead to a device crash
An Improper Check for Unusual or Exceptional Conditions vulnerability in the kernel of Juniper Network Junos OS on MX Series allows a network based attacker with low privileges to cause a denial of service.
If a scaled configuration for Source class usage (SCU) / destination class usage (DCU) (more than 10 route classes) is present and the SCU/DCU statistics are gathered by executing specific SNMP requests or CLI commands, a 'vmcore' for the RE kernel will be seen which leads to a device restart. Continued exploitation of this issue will lead to a sustained DoS.
This issue only affects MX Series devices with MPC10, MPC11 or LC9600, and MX304. No other MX Series devices are affected.
This issue affects Juniper Networks Junos OS:
All versions earlier than 20.4R3-S9; 21.2 versions earlier than 21.2R3-S6; 21.3 versions earlier than 21.3R3-S5; 21.4 versions earlier than 21.4R3; 22.1 versions earlier than 22.1R3; 22.2 versions earlier than 22.2R2; 22.3 versions earlier than 22.3R2.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Juniper Network Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 20.4R3-S9 - Upgrade
Upgrade
Juniper Network Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 21.2R3-S6 - Upgrade
Upgrade
Juniper Network Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 21.3R3-S5 - Upgrade
Upgrade
Juniper Network Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 21.4R3 - Upgrade
Upgrade
Juniper Network Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 22.1R3 - Upgrade
Upgrade
Juniper Network Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 22.2R2 - Upgrade
Upgrade
Juniper Network Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 22.3R2 - Upgrade
Upgrade
Juniper Network Junos OS (MX Series)to a version that resolves this vulnerability.Fixed in 22.4R1
Event History
Frequently Asked Questions
What is the severity of CVE-2024-21603?
CVE-2024-21603 has a medium severity level, as it allows a network-based attacker to cause a denial of service with low privileges.
How do I fix CVE-2024-21603?
To fix CVE-2024-21603, apply the latest patches or updates provided by Juniper Networks for the affected versions of Junos OS.
Which versions of Junos OS are affected by CVE-2024-21603?
CVE-2024-21603 affects Junos OS versions 20.4 and 21.2 through 22.3, including specific release iterations.
What type of attack does CVE-2024-21603 enable?
CVE-2024-21603 enables a denial of service attack that can be executed by a low-privileged network-based attacker.
Is authentication required for exploiting CVE-2024-21603?
Authentication is not required to exploit CVE-2024-21603 since it can be executed by low-privileged attackers.