CVE-2024-21611

Junos OS and Junos OS Evolved: In a jflow scenario continuous route churn will cause a memory leak and eventually an rpd crash

Description

A Missing Release of Memory after Effective Lifetime vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS). In a Juniper Flow Monitoring (jflow) scenario route churn that causes BGP next hops to be updated will cause a slow memory leak and eventually a crash and restart of rpd. Thread level memory utilization for the areas where the leak occurs can be checked using the below command: user@host> show task memory detail | match so_in so_in6 28 32 344450 11022400 344760 11032320 so_in 8 16 1841629 29466064 1841734 29467744 This issue affects: Junos OS * 21.4 versions earlier than 21.4R3; * 22.1 versions earlier than 22.1R3; * 22.2 versions earlier than 22.2R3. Junos OS Evolved * 21.4-EVO versions earlier than 21.4R3-EVO; * 22.1-EVO versions earlier than 22.1R3-EVO; * 22.2-EVO versions earlier than 22.2R3-EVO. This issue does not affect: Juniper Networks Junos OS versions earlier than 21.4R1. Juniper Networks Junos OS Evolved versions earlier than 21.4R1.

Remediation

Solution:

  • The following software releases have been updated to resolve this specific issue: Junos OS: 21.4R3, 22.1R3, 22.2R3, 22.3R1, and all subsequent releases. Junos OS Evolved: 21.4R3-EVO, 22.1R3-EVO, 22.2R3-EVO, 22.3R1-EVO, and all subsequent releases.

Workaround:

  • Although not a workaround, it is advised to monitor the memory utilization proactively and when it reaches 85% of total RE memory, restart rpd or reboot the system.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.18%
Vendor Advisory juniper.net
Affected: Juniper Networks Junos OS
Affected: Juniper Networks Junos OS Evolved
Published at:
Updated at:

References

Link Tags
https://supportportal.juniper.net/JSA75752 vendor advisory
https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L technical description third party advisory

Frequently Asked Questions

What is the severity of CVE-2024-21611?
CVE-2024-21611 has been scored as a high severity vulnerability.
How to fix CVE-2024-21611?
To fix CVE-2024-21611: The following software releases have been updated to resolve this specific issue: Junos OS: 21.4R3, 22.1R3, 22.2R3, 22.3R1, and all subsequent releases. Junos OS Evolved: 21.4R3-EVO, 22.1R3-EVO, 22.2R3-EVO, 22.3R1-EVO, and all subsequent releases.
Is CVE-2024-21611 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2024-21611 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-21611?
CVE-2024-21611 affects Juniper Networks Junos OS, Juniper Networks Junos OS Evolved.
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