CVE-2024-39550

Service interruption via port-triggered rtlogd memory leak

Published Jul 11, 2024 · Updated Aug 2, 2024

Memory leak in rtlogd in affected Juniper Networks Junos OS releases on MX Series with SPC3 allows attackers to interrupt service via port flaps. The rtlogd process fails to release memory after processing internally generated events, so repeated port flaps steadily exhaust its memory. Reachability is limited to adjacent attackers able to flap ports on an MX chassis with an SPC3 line card, and recovery requires a manual rtlogd restart.

CVSS severity7.1
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in rtlogd in affected Juniper Networks Junos OS releases on MX Series with SPC3 allows attackers to interrupt service via port flaps. The rtlogd process fails to release memory after processing internally generated events, so repeated port flaps steadily exhaust its memory. Reachability is limited to adjacent attackers able to flap ports on an MX chassis with an SPC3 line card, and recovery requires a manual rtlogd restart.

The record

CVE
CVE-2024-39550
Published
Jul 11, 2024
Updated
Aug 2, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-401, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 11, 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 <21.2R3-S8
  2. Affected versionversion=21.4R2 <21.4R3-S6
  3. Affected versionversion=22.1 <22.1R3-S5
  4. Affected versionversion=22.2 <22.2R3-S3
  5. Affected versionversion=22.3 <22.3R3-S2
  6. Affected versionversion=22.4 <22.4R3-S1
  7. Affected versionversion=23.2 <23.2R2
  8. Affected versionversion=23.4 <23.4R2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=21.2R3 <21.2R3-S8; version=21.4R2 <21.4R3-S6; version=22.1 <22.1R3-S5; version=22.2 <22.2R3-S3; version=22.3 <22.3R3-S2; version=22.4 <22.4R3-S1; version=23.2 <23.2R2; version=23.4 <23.4R2

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:N/R:U
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.

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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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
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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