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Fencer Vulns
high 7.5

CVE-2024-30392 json

Junos OS: MX Series with SPC3 and MS-MPC/-MIC: When URL filtering is enabled and a specific URL request is received a flowd crash occurs

published 2024-04-12 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-28313

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits
0
none known

Summary

A Stack-based Buffer Overflow vulnerability in Flow Processing Daemon (flowd) of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to cause Denial of Service (DoS).

On all Junos OS MX Series platforms with SPC3 and MS-MPC/-MIC, when URL filtering is enabled and a specific URL request is received and processed, flowd will crash and restart. Continuous reception of the specific URL request will lead to a sustained Denial of Service (DoS) condition.

This issue affects: Junos OS:

* all versions before 21.2R3-S6,

* from 21.3 before 21.3R3-S5,

* from 21.4 before 21.4R3-S5,

* from 22.1 before 22.1R3-S3,

* from 22.2 before 22.2R3-S1,

* from 22.3 before 22.3R2-S2, 22.3R3,

* from 22.4 before 22.4R2-S1, 22.4R3.

Patch / fix

  • Juniper Networks Junos OS 21.2R3-S6, 21.3R3-S5, 21.4R3-S5, 22.1R3-S3, 22.2R3-S1, 22.3R2-S2, 22.3R3, 22.4R2-S1, 22.4R3
  • juniper junos_os 21.1r3-s3, 21.2r3-s6, 21.3r3-s5, 21.4r3-s5, 22.2r3-s1, 22.3r2-s2, 22.3r3, 22.4-r2-s2, 22.4r3

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.69% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • Juniper Networks Junos OS
  • juniper junos_os

Classification

Weakness
  • CWE-121 Stack-based Buffer Overflow

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.