CVE-2024-30392Network attack vector

Unauthenticated flowd crash via specific URL request

Published Apr 12, 2024 · Updated Aug 2, 2024

Stack-based buffer overflow in flowd in affected Juniper Networks Junos OS releases allows remote attackers to crash and restart the daemon. While processing a specific URL, flowd overflows a stack-based buffer; Juniper has not disclosed the exact parsing routine or field that exceeds its bounds. URL filtering and SPC3 or MS-MPC/-MIC hardware are required, and repeated requests sustain the service interruption.

CVSS severity7.5
High
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in flowd in affected Juniper Networks Junos OS releases allows remote attackers to crash and restart the daemon. While processing a specific URL, flowd overflows a stack-based buffer; Juniper has not disclosed the exact parsing routine or field that exceeds its bounds. URL filtering and SPC3 or MS-MPC/-MIC hardware are required, and repeated requests sustain the service interruption.

The record

CVE
CVE-2024-30392
Published
Apr 12, 2024
Updated
Aug 2, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-121, T1499.004
Attack vector
network
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

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-s6
  2. Affected versionversion=0 <21.2R3-S6
  3. Affected versionversion=21.3 <21.3r3-s5
  4. Affected versionversion=21.3 <21.3R3-S5
  5. Affected versionversion=21.4 <21.4r3-s5
  6. Affected versionversion=21.4 <21.4R3-S5
  7. Affected versionversion=22.1 <21.1r3-s3
  8. Affected versionversion=22.1 <22.1R3-S3
  9. Affected versionversion=22.2 <22.2r3-s1
  10. Affected versionversion=22.2 <22.2R3-S1
  11. Affected versionversion=22.3 <22.3r2-s2
  12. Affected versionversion=22.3 <22.3R2-S2, 22.3R3
  13. Affected versionversion=22.3 <22.3r3
  14. Affected versionversion=22.4 <22.4R2-S1, 22.4R3
  15. Affected versionversion=22.4 <22.4-r2-s2
  16. Affected versionversion=22.4 <22.4r3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=0 <21.2r3-s6; version=0 <21.2R3-S6; version=21.3 <21.3r3-s5; version=21.3 <21.3R3-S5; version=21.4 <21.4r3-s5; version=21.4 <21.4R3-S5; version=22.1 <21.1r3-s3; version=22.1 <22.1R3-S3; version=22.2 <22.2r3-s1; version=22.2 <22.2R3-S1; version=22.3 <22.3r2-s2; version=22.3 <22.3R2-S2, 22.3R3; version=22.3 <22.3r3; version=22.4 <22.4R2-S1, 22.4R3; version=22.4 <22.4-r2-s2; version=22.4 <22.4r3

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
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-121Stack-based Buffer Overflow
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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