CVE-2024-39547Network attack vector

Service interruption via exceptional TCP session handling

Published Oct 11, 2024 · Updated Oct 11, 2024

Improper exceptional-condition handling in cRPD on Junos OS and Junos OS Evolved allows remote attackers to cause CPU-based denial of service. The rpd-server repeatedly performs unexpected reads after crafted TCP traffic reaches the routing engine or a TCP session terminates unexpectedly, driving control-plane CPU utilization upward. No special configuration is required; BGP RIB sharding increases the impact, which is limited to service interruption from CPU exhaustion.

CVSS severity8.7
High
EPSS probability0.97%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper exceptional-condition handling in cRPD on Junos OS and Junos OS Evolved allows remote attackers to cause CPU-based denial of service. The rpd-server repeatedly performs unexpected reads after crafted TCP traffic reaches the routing engine or a TCP session terminates unexpectedly, driving control-plane CPU utilization upward. No special configuration is required; BGP RIB sharding increases the impact, which is limited to service interruption from CPU exhaustion.

The record

CVE
CVE-2024-39547
Published
Oct 11, 2024
Updated
Oct 11, 2024
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-755, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 11, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 11, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <21.4r3-s7-evo
  2. Affected versionversion=0 <21.4R3-S7-EVO
  3. Affected versionversion=22.2-evo <22.2r3-s4-evo
  4. Affected versionversion=22.2-EVO <22.2R3-S4-EVO
  5. Affected versionversion=22.3-evo <22.3r3-s3-evo
  6. Affected versionversion=22.3-EVO <22.3R3-S3-EVO
  7. Affected versionversion=22.4-evo <22.4r3-s2-evo
  8. Affected versionversion=22.4-EVO <22.4R3-S2-EVO
  9. Affected versionversion=23.2-evo <23.2r2-evo
  10. Affected versionversion=23.2-EVO <23.2R2-EVO

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=0 <21.4r3-s7-evo; version=0 <21.4R3-S7-EVO; version=22.2-evo <22.2r3-s4-evo; version=22.2-EVO <22.2R3-S4-EVO; version=22.3-evo <22.3r3-s3-evo; version=22.3-EVO <22.3R3-S3-EVO; version=22.4-evo <22.4r3-s2-evo; version=22.4-EVO <22.4R3-S2-EVO; version=23.2-evo <23.2r2-evo; version=23.2-EVO <23.2R2-EVO
Juniper Networks · Junos OSversion=0 <21.2r3-s8; version=0 <21.2R3-S8; version=21.4 <21.4r3-s7; version=21.4 <21.4R3-S7; version=22.1 <22.1r3-s6; version=22.1 <22.1R3-S6; version=22.2 <22.2r3-s4; version=22.2 <22.2R3-S4; version=22.3 <22.3r3-s3; version=22.3 <22.3R3-S3; version=22.4 <22.4r3-s2; version=22.4 <22.4R3-S2; version=23.2 <23.2r2-s2; version=23.2 <23.2R2-S2; version=24.2 <24.2r2; version=24.2 <24.2R2

Published CVSS scores

8.7Juniper NetworksCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:U
7.5Juniper NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-755Improper Handling of Exceptional Conditions
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo