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TI-2019-00040 Aliases CVE-2019-0041GHSA-5jhv-p44r-72j3

Junos OS: EX4300-MP Series: IP transit traffic can reach the control plane via loopback interface.

Priority LOW 39CWE-284Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-284.

Summary

On EX4300-MP Series devices with any lo0 filters applied, transit network traffic may reach the control plane via loopback interface (lo0). The device may fail to forward such traffic. This issue affects Juniper Networks Junos OS 18.2 versions prior to 18.2R1-S2, 18.2R2 on EX4300-MP Series. This issue does not affect any other EX series devices.

Why it matters now

EPSS 0.00871 59th percentileScored 2026-11-07
Fix Fixed Junos OS (Juniper Networks): 18.2R1-S2, 18.2R2

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
JuniperJunos OS18.2 to before 18.2R1-S2, 18.2R218.2R1-S2, 18.2R2Patch availableCNA
  • Junos OS VendorJuniper Affected 18.2 to before 18.2R1-S2, 18.2R2 Fixed in 18.2R1-S2, 18.2R2 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:o:juniper:junos:18.2:-:*:*:*:*:*:*18.2VulnerableJuniper
cpe:2.3:o:juniper:junos:18.2:r1:*:*:*:*:*:*18.2 r1VulnerableJuniper
cpe:2.3:h:juniper:ex4300-mp:-:*:*:*:*:*:*:*not specified by NVDRunning onJuniper
  • cpe:2.3:o:juniper:junos:18.2:-:*:*:*:*:*:* Versions 18.2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.2:r1:*:*:*:*:*:* Versions 18.2 r1 Vulnerable ·Juniper
  • cpe:2.3:h:juniper:ex4300-mp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper

Remediation

  • Fix · CNA Junos OS (Juniper Networks) Fixed in 18.2R1-S2, 18.2R2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-0041
  2. 2026-10-03 Alias added: GHSA-5jhv-p44r-72j3

References

Advisory 1

  • TI-2023-18638 Junos OS: EX and SRX Series: A PHP vulnerability in J-Web allows an unauthenticated to… KEVCVSS 3.1CRITICAL 9.8
  • TI-2020-01585 Out of Cycle Security Advisory: Junos OS: Security vulnerability in J-Web and web based (HTTP/HTTPS) services KEVCVSS 3.1CRITICAL 9.8
  • TI-2015-04610 Assertion failure in ISC BIND named via TKEY queries KEVCVSS 3.1HIGH 7.5
  • TI-2025-15550 Junos OS: An local attacker with shell access can execute arbitrary code KEVCVSS 4.0MEDIUM 6.7
  • TI-2023-18644 Junos OS: SRX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload and download arbitrary files KEVCVSS 3.1MEDIUM 5.3
  • TI-2023-18640 Junos OS: EX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload arbitrary files KEVCVSS 3.1MEDIUM 5.3
See all 792 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences