An Unchecked Input for Loop Condition 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).Micro-BFD session flaps generate respective up/down events which are queued by PFEMAN for processing. Especially in a Virtual-Chassis (VC) scenario with locality‑bias configured, processing takes a significant amount of time for each event. If these sessions keep flapping, new events are constantly added, and in turn PFEMAN never completes processing these events.
This results in the PFEMAN watchdog timer expiring, which causes the FPC to crash and restart, representing a complete service outage. This issue only affects MX series FPCs up to and including MPC9, and LC2101/2103 and LC480. It does not affect MPC10/11, LC4800/9600, and MX304.
This issue affects Junos OS on MX Series: * all versions before 23.2R2-S7, * 23.4 versions before 23.4R2-S8, * 24.2 versions before 24.2R2-S4, * 24.4 versions before 24.4R2-S3, * 25.2 versions before 25.2R2.
Attack Parameters
Attack Vector
Adjacent
Requires local network access
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 66
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Juniper Junos
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
|
— |
23.2
|
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.2:r1:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.2:r1-s1:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.2:r1-s2:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.2:r2:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.2:r2-s1:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.2:r2-s2:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.2:r2-s3:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.2:r2-s4:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.2:r2-s5:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.2:r2-s6:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.4:-:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.4:r1:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.4:r1-s1:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.4:r1-s2:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.4:r2:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.4:r2-s1:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.4:r2-s2:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.4:r2-s3:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.4:r2-s4:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.4:r2-s5:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.4:r2-s6:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:23.4:r2-s7:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:24.2:-:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:24.2:r1:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:24.2:r1-s1:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:24.2:r1-s2:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:24.2:r2:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:24.2:r2-s1:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:24.2:r2-s2:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:24.2:r2-s3:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:24.4:-:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:24.4:r1:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:24.4:r1-s2:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:24.4:r1-s3:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:24.4:r2:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:24.4:r2-s1:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:24.4:r2-s2:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:25.2:-:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:25.2:r1:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:25.2:r1-s1:*:*:*:*:*:*
|
— | — |
|
Juniper Junos
cpe:2.3:o:juniper:junos:25.2:r1-s2:*:*:*:*:*:*
|
— | — |
|
Juniper Lc2101
cpe:2.3:h:juniper:lc2101:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Lc2103
cpe:2.3:h:juniper:lc2103:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Lc4800
cpe:2.3:h:juniper:lc4800:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc1
cpe:2.3:h:juniper:mpc1:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc1_Q
cpe:2.3:h:juniper:mpc1_q:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc1e
cpe:2.3:h:juniper:mpc1e:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc1e_Q
cpe:2.3:h:juniper:mpc1e_q:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc2
cpe:2.3:h:juniper:mpc2:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc2_Eq
cpe:2.3:h:juniper:mpc2_eq:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc2_Q
cpe:2.3:h:juniper:mpc2_q:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc2e
cpe:2.3:h:juniper:mpc2e:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc2e_Eq
cpe:2.3:h:juniper:mpc2e_eq:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc2e_Ng
cpe:2.3:h:juniper:mpc2e_ng:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc2e_Ng_Q
cpe:2.3:h:juniper:mpc2e_ng_q:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc2e_P
cpe:2.3:h:juniper:mpc2e_p:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc2e_Q
cpe:2.3:h:juniper:mpc2e_q:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc3e
cpe:2.3:h:juniper:mpc3e:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc3e-3d-Ng
cpe:2.3:h:juniper:mpc3e-3d-ng:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc3e-3d-Ng-Q
cpe:2.3:h:juniper:mpc3e-3d-ng-q:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc6e
cpe:2.3:h:juniper:mpc6e:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc7e-10g
cpe:2.3:h:juniper:mpc7e-10g:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc7e-Mrate
cpe:2.3:h:juniper:mpc7e-mrate:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc8e
cpe:2.3:h:juniper:mpc8e:-:*:*:*:*:*:*:*
|
— | — |
|
Juniper Mpc9e
cpe:2.3:h:juniper:mpc9e:-:*:*:*:*:*:*:*
|
— | — |