CVE-2024-39539
Junos OS: MX Series: Continuous subscriber logins will lead to a memory leak and eventually an FPC crash
A Missing Release of Memory after Effective Lifetime vulnerability in Juniper Networks Junos OS on MX Series allows an unauthenticated adjacent attacker to cause a Denial-of-Service (DoS).
In a subscriber management scenario continuous subscriber logins will trigger a memory leak and eventually lead to an FPC crash and restart.
This issue affects Junos OS on MX Series:
- All version before 21.2R3-S6,
- 21.4 versions before 21.4R3-S6,
- 22.1 versions before 22.1R3-S5,
- 22.2 versions before 22.2R3-S3,
- 22.3 versions before 22.3R3-S2,
- 22.4 versions before 22.4R3,
- 23.2 versions before 23.2R2.
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: Continuous subscriber logins will lead to a memory leak and eventually an FPC crash
A Missing Release of Memory after Effective Lifetime vulnerability in Juniper Networks Junos OS on MX Series allows an unauthenticated adjacent attacker to cause a Denial-of-Service (DoS).
In a subscriber management scenario continuous subscriber logins will trigger a memory leak and eventually lead to an FPC crash and restart.
This issue affects Junos OS on MX Series:
- All version before 21.2R3-S6,
- 21.4 versions before 21.4R3-S6,
- 22.1 versions before 22.1R3-S5,
- 22.2 versions before 22.2R3-S3,
- 22.3 versions before 22.3R3-S2,
- 22.4 versions before 22.4R3,
- 23.2 versions before 23.2R2.
- Record
CVE-2024-39539- CVSS 4.0
- 6.0 Medium
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-401
- Updated
- 2026-11-02
EUVDEUVD-2024-38065
A Missing Release of Memory after Effective Lifetime vulnerability in Juniper Networks Junos OS on MX Series allows an unauthenticated adjacent attacker to cause a Denial-of-Service (DoS).
In a subscriber management scenario continuous subscriber logins will trigger a memory leak and eventually lead to an FPC crash and restart.
This issue affects Junos OS on MX Series:
- All version before 21.2R3-S6,
- 21.4 versions before 21.4R3-S6,
- 22.1 versions before 22.1R3-S5,
- 22.2 versions before 22.2R3-S3,
- 22.3 versions before 22.3R3-S2,
- 22.4 versions before 22.4R3,
- 23.2 versions before 23.2R2.
- Record
EUVD-2024-38065- CVSS 4.0
- 6.0 Medium
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-5gvg-fggq-r6f6
A Missing Release of Memory after Effective Lifetime vulnerability in Juniper Networks Junos OS...
A Missing Release of Memory after Effective Lifetime vulnerability in Juniper Networks Junos OS on MX Series allows an unauthenticated adjacent attacker to cause a Denial-of-Service (DoS).
In a subscriber management scenario continuous subscriber logins will trigger a memory leak and eventually lead to an FPC crash and restart.
This issue affects Junos OS on MX Series:
- All version before 21.2R3-S6,
- 21.4 versions before 21.4R3-S6,
- 22.1 versions before 22.1R3-S5,
- 22.2 versions before 22.2R3-S3,
- 22.3 versions before 22.3R3-S2,
- 22.4 versions before 22.4R3,
- 23.2 versions before 23.2R2.
- Record
GHSA-5gvg-fggq-r6f6- CVSS 4.0
- 6.0 Medium
CVSS:4.0/AV:A/AC:L/AT:P/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
- 5.3 Medium
CVSS:3.1/AV:A/AC:H/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 Juniper Networks Junos OS on MX Series allows an unauthenticated adjacent attacker to cause a Denial-of-Service (DoS).
In a subscriber management scenario continuous subscriber logins will trigger a memory leak and eventually lead to an FPC crash and restart.
This issue affects Junos OS on MX Series:
- All version before 21.2R3-S6,
- 21.4 versions before 21.4R3-S6,
- 22.1 versions before 22.1R3-S5,
- 22.2 versions before 22.2R3-S3,
- 22.3 versions before 22.3R3-S2,
- 22.4 versions before 22.4R3,
- 23.2 versions before 23.2R2.
- Record
CVE-2024-39539- CVSS 4.0
- 6.0 Medium
CVSS:4.0/AV:A/AC:L/AT:P/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
- 5.3 Medium
CVSS:3.1/AV:A/AC:H/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 |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2024-39539 is a medium vulnerability (CVSS 6.0) in Juniper Junos, published July 11, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.22%, the 12th percentile. No source names a fixed version.