CVE-2024-39536
Junos OS and Junos OS Evolved: Flaps of BFD sessions with authentication cause a ppmd memory leak
A Missing Release of Memory after Effective Lifetime vulnerability in the Periodic Packet Management Daemon (ppmd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a
Denial-of-Service (DoS).
When a BFD session configured with authentication flaps, ppmd memory can leak. Whether the leak happens depends on a race condition which is outside the attackers control. This issue only affects BFD operating in distributed aka delegated (which is the default behavior) or inline mode.
Whether the leak occurs can be monitored with the following CLI command:
show ppm request-queue
FPC Pending-request fpc0 2 request-total-pending: 2
where a continuously increasing number of pending requests is indicative of the leak.
This issue affects:
Junos OS:
- All versions before 21.2R3-S8,
- 21.4 versions before 21.4R3-S7,
- 22.1 versions before 22.1R3-S4,
- 22.2 versions before 22.2R3-S4,
- 22.3 versions before 22.3R3,
- 22.4 versions before 22.4R2-S2, 22.4R3.
Junos OS Evolved:
- All versions before 21.2R3-S8-EVO,
- 21.4-EVO versions before 21.4R3-S7-EVO,
- 22.2-EVO versions before 22.2R3-S4-EVO,
- 22.3-EVO versions before 22.3R3-EVO,
- 22.4-EVO versions before 22.4R3-EVO.
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 and Junos OS Evolved: Flaps of BFD sessions with authentication cause a ppmd memory leak
A Missing Release of Memory after Effective Lifetime vulnerability in the Periodic Packet Management Daemon (ppmd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a
Denial-of-Service (DoS).
When a BFD session configured with authentication flaps, ppmd memory can leak. Whether the leak happens depends on a race condition which is outside the attackers control. This issue only affects BFD operating in distributed aka delegated (which is the default behavior) or inline mode.
Whether the leak occurs can be monitored with the following CLI command:
show ppm request-queue
FPC Pending-request fpc0 2 request-total-pending: 2
where a continuously increasing number of pending requests is indicative of the leak.
This issue affects:
Junos OS:
- All versions before 21.2R3-S8,
- 21.4 versions before 21.4R3-S7,
- 22.1 versions before 22.1R3-S4,
- 22.2 versions before 22.2R3-S4,
- 22.3 versions before 22.3R3,
- 22.4 versions before 22.4R2-S2, 22.4R3.
Junos OS Evolved:
- All versions before 21.2R3-S8-EVO,
- 21.4-EVO versions before 21.4R3-S7-EVO,
- 22.2-EVO versions before 22.2R3-S4-EVO,
- 22.3-EVO versions before 22.3R3-EVO,
- 22.4-EVO versions before 22.4R3-EVO.
- Record
CVE-2024-39536- 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:N - 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-2024-38062
A Missing Release of Memory after Effective Lifetime vulnerability in the Periodic Packet Management Daemon (ppmd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a
Denial-of-Service (DoS).
When a BFD session configured with authentication flaps, ppmd memory can leak. Whether the leak happens depends on a race condition which is outside the attackers control. This issue only affects BFD operating in distributed aka delegated (which is the default behavior) or inline mode.
Whether the leak occurs can be monitored with the following CLI command:
show ppm request-queue
FPC Pending-request fpc0 2 request-total-pending: 2
where a continuously increasing number of pending requests is indicative of the leak.
This issue affects:
Junos OS:
- All versions before 21.2R3-S8,
- 21.4 versions before 21.4R3-S7,
- 22.1 versions before 22.1R3-S4,
- 22.2 versions before 22.2R3-S4,
- 22.3 versions before 22.3R3,
- 22.4 versions before 22.4R2-S2, 22.4R3.
Junos OS Evolved:
- All versions before 21.2R3-S8-EVO,
- 21.4-EVO versions before 21.4R3-S7-EVO,
- 22.2-EVO versions before 22.2R3-S4-EVO,
- 22.3-EVO versions before 22.3R3-EVO,
- 22.4-EVO versions before 22.4R3-EVO.
- Record
EUVD-2024-38062- 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:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-vpjj-mfgj-j3mj
A Missing Release of Memory after Effective Lifetime vulnerability in the Periodic Packet...
A Missing Release of Memory after Effective Lifetime vulnerability in the Periodic Packet Management Daemon (ppmd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a
Denial-of-Service (DoS).
When a BFD session configured with authentication flaps, ppmd memory can leak. Whether the leak happens depends on a race condition which is outside the attackers control. This issue only affects BFD operating in distributed aka delegated (which is the default behavior) or inline mode.
Whether the leak occurs can be monitored with the following CLI command:
show ppm request-queue
FPC Pending-request fpc0 2 request-total-pending: 2
where a continuously increasing number of pending requests is indicative of the leak.
This issue affects:
Junos OS:
- All versions before 21.2R3-S8,
- 21.4 versions before 21.4R3-S7,
- 22.1 versions before 22.1R3-S4,
- 22.2 versions before 22.2R3-S4,
- 22.3 versions before 22.3R3,
- 22.4 versions before 22.4R2-S2, 22.4R3,
- 23.1 versions before 23.1R2.
Junos OS Evolved:
- All versions before 21.2R3-S8-EVO,
- 21.4-EVO versions before 21.4R3-S7-EVO,
- 22.2-EVO versions before 22.2R3-S4-EVO,
- 22.3-EVO versions before 22.3R3-EVO,
- 22.4-EVO versions before 22.4R3-EVO,
- 23.2-EVO versions before 23.2R1-EVO.
- Record
GHSA-vpjj-mfgj-j3mj- 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:N/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 the Periodic Packet Management Daemon (ppmd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a
Denial-of-Service (DoS).
When a BFD session configured with authentication flaps, ppmd memory can leak. Whether the leak happens depends on a race condition which is outside the attackers control. This issue only affects BFD operating in distributed aka delegated (which is the default behavior) or inline mode.
Whether the leak occurs can be monitored with the following CLI command:
show ppm request-queue
FPC Pending-request fpc0 2 request-total-pending: 2
where a continuously increasing number of pending requests is indicative of the leak.
This issue affects:
Junos OS:
- All versions before 21.2R3-S8,
- 21.4 versions before 21.4R3-S7,
- 22.1 versions before 22.1R3-S4,
- 22.2 versions before 22.2R3-S4,
- 22.3 versions before 22.3R3,
- 22.4 versions before 22.4R2-S2, 22.4R3.
Junos OS Evolved:
- All versions before 21.2R3-S8-EVO,
- 21.4-EVO versions before 21.4R3-S7-EVO,
- 22.2-EVO versions before 22.2R3-S4-EVO,
- 22.3-EVO versions before 22.3R3-EVO,
- 22.4-EVO versions before 22.4R3-EVO.
- Record
CVE-2024-39536- 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:N/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-2024-39536 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 0.23%, the 13th percentile. No source names a fixed version.