CVE-2024-47502

Junos OS Evolved: TCP session state is not always cleared on the Routing Engine leading to DoS

Description

An Allocation of Resources Without Limits or Throttling vulnerability in the kernel of Juniper Networks Junos OS Evolved allows an unauthenticated, network based attacker to cause a Denial of Service (DoS). In specific cases the state of TCP sessions that are terminated is not cleared, which over time leads to an exhaustion of resources, preventing new connections to the control plane from being established. A continuously increasing number of connections shown by: user@host > show system connections is indicative of the problem. To recover the respective RE needs to be restarted manually. This issue only affects IPv4 but does not affect IPv6. This issue only affects TCP sessions established in-band (over an interface on an FPC) but not out-of-band (over the management ethernet port on the routing-engine). This issue affects Junos OS Evolved:  * All versions before 21.4R3-S9-EVO, * 22.2 versions before 22.2R3-S4-EVO, * 22.4 version before 22.4R3-S3-EVO, * 23.2 versions before 23.2R2-S1-EVO, * 23.4 versions before 23.4R2-EVO.

Remediation

Solution:

  • The following software releases have been updated to resolve this specific issue: 21.4R3-S9-EVO, 22.2R3-S4-EVO, 22.4R3-S3-EVO, 23.2R2-S1-EVO, 23.4R2-EVO, 24.2R1-EVO, and all subsequent releases.

Workaround:

  • There are no viable workarounds for this issue. To reduce the risk of exploitation use access lists or firewall filters to limit access to the device only from trusted, administrative networks or hosts.

Category

8.7
CVSS
Severity: High
CVSS 4.0 •
CVSS 3.1 •
EPSS 0.27%
Vendor Advisory juniper.net
Affected: Juniper Networks Junos OS Evolved
Published at:
Updated at:

References

Link Tags
https://supportportal.juniper.net/JSA88132 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2024-47502?
CVE-2024-47502 has been scored as a high severity vulnerability.
How to fix CVE-2024-47502?
To fix CVE-2024-47502: The following software releases have been updated to resolve this specific issue: 21.4R3-S9-EVO, 22.2R3-S4-EVO, 22.4R3-S3-EVO, 23.2R2-S1-EVO, 23.4R2-EVO, 24.2R1-EVO, and all subsequent releases.
Is CVE-2024-47502 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2024-47502 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-2024-47502?
CVE-2024-47502 affects Juniper Networks Junos OS Evolved.
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