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Medium severity6.5NVD Advisory· Published Jan 12, 2024· Updated Jun 17, 2026

CVE-2024-21600

CVE-2024-21600

Description

An Improper Neutralization of Equivalent Special Elements vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on PTX Series allows a unauthenticated, adjacent attacker to cause a Denial of Service (DoS).

When MPLS packets are meant to be sent to a flexible tunnel interface (FTI) and if the FTI tunnel is down, these will hit the reject NH, due to which the packets get sent to the CPU and cause a host path wedge condition. This will cause the FPC to hang and requires a manual restart to recover.

Please note that this issue specifically affects PTX1000, PTX3000, PTX5000 with FPC3, PTX10002-60C, and PTX10008/16 with LC110x. Other PTX Series devices and Line Cards (LC) are not affected.

The following log message can be seen when the issue occurs:

Cmerror Op Set: Host Loopback: HOST LOOPBACK WEDGE DETECTED IN PATH ID (URI: /fpc//pfe//cm//Host_Loopback//HOST_LOOPBACK_MAKE_CMERROR_ID[]) This issue affects Juniper Networks Junos OS:

  • All versions earlier than 20.4R3-S8;
  • 21.1 versions earlier than 21.1R3-S4;
  • 21.2 versions earlier than 21.2R3-S6;
  • 21.3 versions earlier than 21.3R3-S3;
  • 21.4 versions earlier than 21.4R3-S5;
  • 22.1 versions earlier than 22.1R2-S2, 22.1R3;
  • 22.2 versions earlier than 22.2R2-S1, 22.2R3.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

73
  • Juniper Networks/Junos72 versions
    cpe:2.3:o:juniper:junos:20.4:-:*:*:*:*:*:*+ 71 more
    • cpe:2.3:o:juniper:junos:20.4:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.4:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.4:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.4:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.4:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.4:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.4:r3-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.4:r3-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.4:r3-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.4:r3-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.4:r3-s5:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.4:r3-s6:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.4:r3-s7:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.4:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.1:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.1:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.1:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.1:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.1:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.1:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.1:r3-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.1:r3-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.1:r3-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.1:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.2:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.2:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.2:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.2:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.2:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.2:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.2:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.2:r3-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.2:r3-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.2:r3-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.2:r3-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.2:r3-s5:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.2:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.3:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.3:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.3:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.3:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.3:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.3:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.3:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.3:r3-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.3:r3-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.3:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.4:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.4:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.4:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.4:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.4:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.4:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.4:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.4:r3-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.4:r3-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.4:r3-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.4:r3-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.4:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.1:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.1:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.1:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.1:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.1:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.1:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.2:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.2:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.2:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.2:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:22.2:r2:*:*:*:*:*:*
    • (no CPE)range: <20.4R3-S8, <21.1R3-S4, <21.2R3-S6, <21.3R3-S3, <21.4R3-S5, <22.1R2-S2, <22.1R3, <22.2R2-S1, <22.2R3
    • (no CPE)range: 0
  • Juniper Networks/PTX Seriesllm-create
    Range: <20.4R3-S8, <21.1R3-S4, <21.2R3-S6, <21.3R3-S3, <21.4R3-S5, <22.1R2-S2, <22.1R3, <22.2R2-S1, <22.2R3

Patches

Vulnerability mechanics

References

2

News mentions

0

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