CVE-2025-30647
Junos OS: MX Series: Subscriber login/logout activity will lead to a memory leak
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.
Attack profile
How easy it is to exploit
- Attack vector
- Adjacent network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Junos OS: MX Series: Subscriber login/logout activity will lead to a memory leak
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.
- Record
CVE-2025-30647- CVSS 4.0
- 7.1 High
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-401
- Updated
- 2026-11-02
EUVDEUVD-2025-10524
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.
- Record
EUVD-2025-10524- CVSS 4.0
- 7.1 High
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-f7rm-gv39-r2j5
A Missing Release of Memory after Effective Lifetime vulnerability in the packet forwarding...
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.
- Record
GHSA-f7rm-gv39-r2j5- CVSS 4.0
- 7.1 High
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-401
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2025-30647- CVSS 4.0
- 7.1 High
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-401
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-30647 is a high vulnerability (CVSS 7.1) in Juniper Junos, published April 9, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.25%, the 16th percentile. No source names a fixed version.