CVE-2024-39550

Junos OS: MX Series with SPC3 line card: Port flaps causes rtlogd memory leak leading to Denial of Service

Description

A Missing Release of Memory after Effective Lifetime vulnerability in the rtlogd process of Juniper Networks Junos OS on MX Series with SPC3 allows an unauthenticated, adjacent attacker to trigger internal events cause ( which can be done by repeated port flaps) to cause a slow memory leak, ultimately leading to a Denial of Service (DoS). Memory can only be recovered by manually restarting rtlogd process.  The memory usage can be monitored using the below command. ????user@host> show system processes extensive | match rtlog  This issue affects Junos OS on MX Series with SPC3 line card:  * from 21.2R3 before 21.2R3-S8,  * from 21.4R2 before 21.4R3-S6,  * from 22.1 before 22.1R3-S5,  * from 22.2 before 22.2R3-S3,  * from 22.3 before 22.3R3-S2,  * from 22.4 before 22.4R3-S1,  * from 23.2 before 23.2R2,  * from 23.4 before 23.4R2.

Remediation

Solution:

  • The following software releases have been updated to resolve this specific issue: Junos OS: 21.2R3-S8, 21.4R3-S6, 22.1R3-S5, 22.2R3-S3, 22.3R3-S2, 22.4R3-S1, 23.2R2, 23.4R2, 24.2R1, and all subsequent releases.

Workaround:

  • There are no known workarounds for this issue.

Category

7.1
CVSS
Severity: High
CVSS 4.0 •
CVSS 3.1 •
EPSS 0.07%
Vendor Advisory juniper.net
Affected: Juniper Networks Junos OS
Published at:
Updated at:

References

Frequently Asked Questions

What is the severity of CVE-2024-39550?
CVE-2024-39550 has been scored as a high severity vulnerability.
How to fix CVE-2024-39550?
To fix CVE-2024-39550: The following software releases have been updated to resolve this specific issue: Junos OS: 21.2R3-S8, 21.4R3-S6, 22.1R3-S5, 22.2R3-S3, 22.3R3-S2, 22.4R3-S1, 23.2R2, 23.4R2, 24.2R1, and all subsequent releases.
Is CVE-2024-39550 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2024-39550 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-2024-39550?
CVE-2024-39550 affects Juniper Networks Junos OS.
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