CVE-2024-39547

Junos OS and Junos OS Evolved: cRPD: Receipt of crafted TCP traffic can trigger high CPU utilization

HIGH

7.5

CVSS Score

Published: October 11, 2024 at 03:20 PM UTC

Updated: June 17, 2026 at 07:42 AM UTC

4 products affected across 2 vendorsJunos Containerized Routing Protocol DaemonJunosJunos OS Evolved

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Severity

HIGH7.5

Exploit prediction

EPSS 1.0%

SSVC

No known exploit

Description

An Improper Handling of Exceptional Conditions vulnerability in the rpd-server of Juniper Networks Junos OS and Junos OS Evolved within cRPD allows an unauthenticated network-based attacker sending crafted TCP traffic to the routing engine (RE) to cause a CPU-based Denial of Service (DoS). If specially crafted TCP traffic is received by the control plane, or a TCP session terminates unexpectedly, it will cause increased control plane CPU utilization by the rpd-server process. While not explicitly required, the impact is more severe when RIB sharding is enabled. Task accounting shows unexpected reads by the RPD Server jobs for shards: user@junos> show task accounting detail ... read:RPD Server.0.0.0.0+780.192.168.0.78+48886 TOT:00000003.00379787 MAX:00000000.00080516 RUNS: 233888\ read:RPD Server.0.0.0.0+780.192.168.0.78+49144 TOT:00000004.00007565 MAX:00000000.00080360 RUNS: 233888\ read:RPD Server.0.0.0.0+780.192.168.0.78+49694 TOT:00000003.00600584 MAX:00000000.00080463 RUNS: 233888\ read:RPD Server.0.0.0.0+780.192.168.0.78+50246 TOT:00000004.00346998 MAX:00000000.00080338 RUNS: 233888\ This issue affects: Junos OS with cRPD: * All versions before 21.2R3-S8, * 21.4 before 21.4R3-S7, * 22.1 before 22.1R3-S6, * 22.2 before 22.2R3-S4, * 22.3 before 22.3R3-S3, * 22.4 before 22.4R3-S2, * 23.2 before 23.2R2-S2, * 24.2 before 24.2R2; Junos OS Evolved with cRPD: * All versions before 21.4R3-S7-EVO, * 22.2 before 22.2R3-S4-EVO, * 22.3 before 22.3R3-S3-EVO, * 22.4 before 22.4R3-S2-EVO, * 23.2 before 23.2R2-EVO.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Junos Containerized Routing Protocol Daemon · Juniper

95%

All versions

juniper-junos-os-evolved (environment) · juniper-networks-junos (environment)

Junos OS Evolved · Juniper

60%

v < 21.4r3-s7-evo22.2-evo ≤ v < 22.2r3-s4-evo22.3-evo ≤ v < 22.3r3-s3-evo22.4-evo ≤ v < 22.4r3-s2-evo23.2-evo ≤ v < 23.2r2-evo22.2-evo22.3-evo22.4-evo23.2-evo

Affected range stops below 21.4r3-s7-evo, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2r3-s4-evo, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.3r3-s3-evo, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.4r3-s2-evo, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.2r2-evo, so it looks safe — our inference, not a vendor statement

Junos · Juniper Networks

60%

v < 21.2R3-S8v < 21.2r3-s821.4 ≤ v < 21.4R3-S721.4 ≤ v < 21.4r3-s722.1 ≤ v < 22.1R3-S622.1 ≤ v < 22.1r3-s622.2 ≤ v < 22.2R3-S422.2 ≤ v < 22.2r3-s422.3 ≤ v < 22.3R3-S322.3 ≤ v < 22.3r3-s322.4 ≤ v < 22.4R3-S222.4 ≤ v < 22.4r3-s223.2 ≤ v < 23.2R2-S223.2 ≤ v < 23.2r2-s224.2 ≤ v < 24.2R224.2 ≤ v < 24.2r221.4 22.1 22.2 22.3 22.4 23.2 24.2

Affected range stops below 21.2R3-S8, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.4R3-S7, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.1R3-S6, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2R3-S4, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.3R3-S3, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.4R3-S2, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.2R2-S2, so it looks safe — our inference, not a vendor statement

Affected range stops below 24.2R2, so it looks safe — our inference, not a vendor statement

Junos OS Evolved · Juniper Networks

60%

v < 21.4R3-S7-EVO22.2-EVO ≤ v < 22.2R3-S4-EVO22.3-EVO ≤ v < 22.3R3-S3-EVO22.4-EVO ≤ v < 22.4R3-S2-EVO23.2-EVO ≤ v < 23.2R2-EVO22.2-EVO 22.3-EVO 22.4-EVO 23.2-EVO

Affected range stops below 21.4R3-S7-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2R3-S4-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.3R3-S3-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.4R3-S2-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.2R2-EVO, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://supportportal.juniper.net/JSA88108

References (1)

Vendor Advisory

Source: [email protected]

https://supportportal.juniper.net/JSA88108

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHjuniper

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-755

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