CVE-2024-39517

Device hang via Layer 2 packet flood

Published Jul 10, 2024 · Updated Aug 2, 2024

Denial of service in Juniper Networks Junos OS and Junos OS Evolved allows attackers to hang EVPN/VXLAN devices. The l2ald daemon mishandles a high volume of specific IPv4 or IPv6 Layer 2 packets, causing rpd to consume all CPU resources. The attacker requires adjacent-network access and an EVPN/VXLAN configuration, and the resulting hang interrupts routing services.

CVSS severity7.1
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Juniper Networks Junos OS and Junos OS Evolved allows attackers to hang EVPN/VXLAN devices. The l2ald daemon mishandles a high volume of specific IPv4 or IPv6 Layer 2 packets, causing rpd to consume all CPU resources. The attacker requires adjacent-network access and an EVPN/VXLAN configuration, and the resulting hang interrupts routing services.

The record

CVE
CVE-2024-39517
Published
Jul 10, 2024
Updated
Aug 2, 2024
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-754, T1499.002
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 10, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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 <21.2R3-S8-EVO
  2. Affected versionversion=21.4-EVO <21.4R3-S7-EVO
  3. Affected versionversion=22.1-EVO <22.1R3-S5-EVO
  4. Affected versionversion=22.2-EVO <22.2R3-S3-EVO
  5. Affected versionversion=22.3-EVO <22.3R3-S3-EVO
  6. Affected versionversion=22.4-EVO <22.4R3-S2-EVO
  7. Affected versionversion=23.2-EVO <23.2R2-EVO
  8. Affected versionversion=23.4-EVO <23.4R1-S1-EVO, 23.4R2-EVO

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=0 <21.2R3-S8-EVO; version=21.4-EVO <21.4R3-S7-EVO; version=22.1-EVO <22.1R3-S5-EVO; version=22.2-EVO <22.2R3-S3-EVO; version=22.3-EVO <22.3R3-S3-EVO; version=22.4-EVO <22.4R3-S2-EVO; version=23.2-EVO <23.2R2-EVO; version=23.4-EVO <23.4R1-S1-EVO, 23.4R2-EVO
Juniper Networks · Junos OSversion=0 <21.2R3-S8; version=21.4 <21.4R3-S7; version=22.1 <22.1R3-S5; version=22.2 <22.2R3-S3; version=22.3 <22.3R3-S3; version=22.4 <22.4R3-S2; version=23.2 <23.2R2; version=23.4 <23.4R1-S1

Published CVSS scores

7.1Juniper Networks, Inc.CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
6.5Juniper Networks, Inc.CVSS:3.1/AV:A/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
T1499.002Service Exhaustion Flood

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

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Your stack

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