CVE-2024-39518Network attack vector

Line-card denial of service via sensord memory leak

Published Jul 10, 2024 · Updated Aug 2, 2024

Heap-based buffer overflow in Junos OS on MX240, MX480, and MX960 with MPC10E allows remote attackers to exhaust sensord memory. With a specific Junos Telemetry Interface subscription active, sensord steadily retains heap memory until it consumes all line-card resources. Network access is unauthenticated, but the affected state requires an MX240, MX480, or MX960 with an MPC10E and active telemetry; recovery requires a manual line-card reboot.

CVSS severity7.5
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in Junos OS on MX240, MX480, and MX960 with MPC10E allows remote attackers to exhaust sensord memory. With a specific Junos Telemetry Interface subscription active, sensord steadily retains heap memory until it consumes all line-card resources. Network access is unauthenticated, but the affected state requires an MX240, MX480, or MX960 with an MPC10E and active telemetry; recovery requires a manual line-card reboot.

The record

CVE
CVE-2024-39518
Published
Jul 10, 2024
Updated
Aug 2, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-122, T1499
Attack vector
network
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

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Is a vulnerable build present?

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

  1. Affected versionversion=21.2R3-S5 <21.2R3-S7
  2. Affected versionversion=21.4R3-S4 <21.4R3-S6
  3. Affected versionversion=22.2R3 <22.2R3-S4
  4. Affected versionversion=22.3R2 <22.3R3-S2
  5. Affected versionversion=22.4R1 <22.4R3
  6. Affected versionversion=23.2R1 <23.2R2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=21.2R3-S5 <21.2R3-S7; version=21.4R3-S4 <21.4R3-S6; version=22.2R3 <22.2R3-S4; version=22.3R2 <22.3R3-S2; version=22.4R1 <22.4R3; version=23.2R1 <23.2R2

Published CVSS scores

7.5Juniper NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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

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.

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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-122Heap-based Buffer Overflow
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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