CVE-2024-30387

PFE crash via unsynchronized statistics access

Published Apr 12, 2024 · Updated Aug 2, 2024

Missing synchronization in Junos OS on ACX5448 and ACX710 allows remote attackers to crash and restart the Packet Forwarding Engine. Concurrent interface-statistics collection and interface flapping let two processes access the same shared resource without synchronization. Exploitation requires adjacent network access and a flap during statistics collection; a successful race interrupts forwarding while the PFE restarts.

CVSS severity7.1
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing synchronization in Junos OS on ACX5448 and ACX710 allows remote attackers to crash and restart the Packet Forwarding Engine. Concurrent interface-statistics collection and interface flapping let two processes access the same shared resource without synchronization. Exploitation requires adjacent network access and a flap during statistics collection; a successful race interrupts forwarding while the PFE restarts.

The record

CVE
CVE-2024-30387
Published
Apr 12, 2024
Updated
Aug 2, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-820, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 12, 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=0 <20.4R3-S9
  2. Affected versionversion=21.2 <21.2R3-S5
  3. Affected versionversion=21.3 <21.3R3-S5
  4. Affected versionversion=21.4 <21.4R3-S4
  5. Affected versionversion=22.1 <22.1R3-S2
  6. Affected versionversion=22.2 <22.2R3-S2
  7. Affected versionversion=22.3 <22.3R2-S2, 22.3R3
  8. Affected versionversion=22.4 <22.4R2, 22.4R3

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=0 <20.4R3-S9; version=21.2 <21.2R3-S5; version=21.3 <21.3R3-S5; version=21.4 <21.4R3-S4; version=22.1 <22.1R3-S2; version=22.2 <22.2R3-S2; version=22.3 <22.3R2-S2, 22.3R3; version=22.4 <22.4R2, 22.4R3

Published CVSS scores

6.5Juniper NetworksCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.1Juniper NetworksCVSS:4.0/AV:A/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-820Missing Synchronization
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

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Your stack

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