CVE-2025-30647: Junos OS: MX Series: Subscriber login/logout activity will lead to a memory leak
First published: Wed Apr 09 2025(Updated: )
A Missing Release of Memory after Effective Lifetime vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on MX Series allows an unauthenticated adjacent attacker to cause a Denial-of-Service (DoS). In a subscriber management scenario, login/logout activity triggers a memory leak, and the leaked memory gradually increments and eventually results in a crash. user@host> show chassis fpc Temp CPU Utilization (%) CPU Utilization (%) Memory Utilization (%) Slot State (C) Total Interrupt 1min 5min 15min DRAM (MB) Heap Buffer 2 Online 36 10 0 9 8 9 32768 26 0 This issue affects Junos OS on MX Series: * All versions before 21.2R3-S9 * from 21.4 before 21.4R3-S10 * from 22.2 before 22.2R3-S6 * from 22.4 before 22.4R3-S5 * from 23.2 before 23.2R2-S3 * from 23.4 before 23.4R2-S3 * from 24.2 before 24.2R2.
Credit: sirt@juniper.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Juniper JUNOS | <21.2R3-S9>=undefined>=undefined>=undefined>=undefined>=undefined>=undefined |
Remedy
The following software releases have been updated to resolve this specific issue: Junos OS: 21.2R3-S9, 21.4R3-S10, 22.2R3-S6, 22.4R3-S5, 23.2R2-S3, 23.4R2-S3, 24.2R2, 24.4R1, and all subsequent releases.
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2025-30647?
CVE-2025-30647 has a severity rating of High due to its potential to cause Denial-of-Service (DoS) by an unauthenticated attacker.
How do I fix CVE-2025-30647?
To address CVE-2025-30647, it is recommended to upgrade to Junos OS version 21.2R3-S10 or later.
Who can exploit CVE-2025-30647?
CVE-2025-30647 can be exploited by unauthenticated adjacent attackers who have access to the affected device.
What systems are affected by CVE-2025-30647?
CVE-2025-30647 affects Juniper Networks Junos OS running on MX Series devices.
What are the potential impacts of CVE-2025-30647?
Exploitation of CVE-2025-30647 may lead to a Denial-of-Service (DoS) condition, impacting network availability.
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