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TI-2020-01581 Aliases CVE-2020-1627GHSA-fg22-5jgq-2wm6

Junos OS: vMX and MX150: Denial of Service vulnerability in packet processing

Priority LOW 36Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

A vulnerability in Juniper Networks Junos OS on vMX and MX150 devices may allow an attacker to cause a Denial of Service (DoS) by sending specific packets requiring special processing in microcode that the flow cache can't handle, causing the riot forwarding daemon to crash. By continuously sending the same specific packets, an attacker can repeatedly crash the riot process causing a sustained Denial of Service. Flow cache is specific to vMX based products and the MX150, and is enabled by default in performance mode. This issue can only be triggered by traffic destined to the device. Transit traffic will not cause the riot daemon to crash. When the issue occurs, a core dump and riot log file entry are generated. For example: /var/crash/core.J-UKERN.mpc0.1557255993.3864.gz /home/pfe/RIOT logs: fpc0 riot[1888]: PANIC in lu_reorder_send_packet_postproc(): fpc0 riot[6655]: PANIC in lu_reorder_send_packet_postproc(): This issue affects Juniper Networks Junos OS: 18.1 versions prior to 18.1R3 on vMX and MX150; 18.2 versions prior to 18.2R3 on vMX and MX150; 18.2X75 versions prior to 18.2X75-D60 on vMX and MX150; 18.3 versions prior to 18.3R3 on vMX and MX150; 18.4 versions prior to 18.4R2 on vMX and MX150; 19.1 versions prior to 19.1R2 on vMX and MX150. This issue does not affect Junos OS versions prior to 18.1R1.

Why it matters now

EPSS 0.0132 71st percentileScored 2026-11-07
Fix Fixed Junos OS (Juniper Networks): 18.1R3, 18.2R3, 18.2X75-D60 +3

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
JuniperJunos OS18.1 to before 18.1R3; 18.2 to before 18.2R3; 18.2X75 to before 18.2X75-D60; 18.3 to before 18.3R3; 18.4 to before 18.4R2; 19.1 to before 19.1R218.1R3, 18.2R3, 18.2X75-D60, 18.3R3, 18.4R2, 19.1R2Patch availableCNA
  • Junos OS VendorJuniper Affected 18.1 to before 18.1R3; 18.2 to before 18.2R3; 18.2X75 to before 18.2X75-D60; 18.3 to before 18.3R3; 18.4 to before 18.4R2; 19.1 to before 19.1R2 Fixed in 18.1R3, 18.2R3, 18.2X75-D60, 18.3R3, 18.4R2, 19.1R2 Patch available CNA

CPE configurations NVD · 40

CPEVersionsRoleVendor
cpe:2.3:o:juniper:junos:18.1:-:*:*:*:*:*:*18.1VulnerableJuniper
cpe:2.3:o:juniper:junos:18.1:r2:*:*:*:*:*:*18.1 r2VulnerableJuniper
cpe:2.3:o:juniper:junos:18.1:r2-s1:*:*:*:*:*:*18.1 r2-s1VulnerableJuniper
cpe:2.3:o:juniper:junos:18.1:r2-s2:*:*:*:*:*:*18.1 r2-s2VulnerableJuniper
cpe:2.3:o:juniper:junos:18.1:r2-s4:*:*:*:*:*:*18.1 r2-s4VulnerableJuniper
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:o:juniper:junos:18.2:r1-s3:*:*:*:*:*:*18.2 r1-s3VulnerableJuniper
cpe:2.3:o:juniper:junos:18.2:r1-s5:*:*:*:*:*:*18.2 r1-s5VulnerableJuniper
cpe:2.3:o:juniper:junos:18.2:r2-s1:*:*:*:*:*:*18.2 r2-s1VulnerableJuniper
  • cpe:2.3:o:juniper:junos:18.1:-:*:*:*:*:*:* Versions 18.1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.1:r2:*:*:*:*:*:* Versions 18.1 r2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.1:r2-s1:*:*:*:*:*:* Versions 18.1 r2-s1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.1:r2-s2:*:*:*:*:*:* Versions 18.1 r2-s2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.1:r2-s4:*:*:*:*:*:* Versions 18.1 r2-s4 Vulnerable ·Juniper
  • 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:o:juniper:junos:18.2:r1-s3:*:*:*:*:*:* Versions 18.2 r1-s3 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.2:r1-s5:*:*:*:*:*:* Versions 18.2 r1-s5 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.2:r2-s1:*:*:*:*:*:* Versions 18.2 r2-s1 Vulnerable ·Juniper
Show 30 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:juniper:junos:18.2:r2-s2:*:*:*:*:*:*18.2 r2-s2VulnerableJuniper
cpe:2.3:o:juniper:junos:18.2:r2-s3:*:*:*:*:*:*18.2 r2-s3VulnerableJuniper
cpe:2.3:o:juniper:junos:18.2:r2-s4:*:*:*:*:*:*18.2 r2-s4VulnerableJuniper
cpe:2.3:o:juniper:junos:18.2:r2-s5:*:*:*:*:*:*18.2 r2-s5VulnerableJuniper
cpe:2.3:o:juniper:junos:18.2:r2-s6:*:*:*:*:*:*18.2 r2-s6VulnerableJuniper
cpe:2.3:o:juniper:junos:18.2x75:-:*:*:*:*:*:*18.2x75VulnerableJuniper
cpe:2.3:o:juniper:junos:18.2x75:d20:*:*:*:*:*:*18.2x75 d20VulnerableJuniper
cpe:2.3:o:juniper:junos:18.2x75:d30:*:*:*:*:*:*18.2x75 d30VulnerableJuniper
cpe:2.3:o:juniper:junos:18.2x75:d40:*:*:*:*:*:*18.2x75 d40VulnerableJuniper
cpe:2.3:o:juniper:junos:18.3:-:*:*:*:*:*:*18.3VulnerableJuniper
cpe:2.3:o:juniper:junos:18.3:r1:*:*:*:*:*:*18.3 r1VulnerableJuniper
cpe:2.3:o:juniper:junos:18.3:r1-s1:*:*:*:*:*:*18.3 r1-s1VulnerableJuniper
cpe:2.3:o:juniper:junos:18.3:r1-s2:*:*:*:*:*:*18.3 r1-s2VulnerableJuniper
cpe:2.3:o:juniper:junos:18.3:r1-s3:*:*:*:*:*:*18.3 r1-s3VulnerableJuniper
cpe:2.3:o:juniper:junos:18.3:r1-s5:*:*:*:*:*:*18.3 r1-s5VulnerableJuniper
cpe:2.3:o:juniper:junos:18.3:r2:*:*:*:*:*:*18.3 r2VulnerableJuniper
cpe:2.3:o:juniper:junos:18.3:r2-s1:*:*:*:*:*:*18.3 r2-s1VulnerableJuniper
cpe:2.3:o:juniper:junos:18.3:r2-s2:*:*:*:*:*:*18.3 r2-s2VulnerableJuniper
cpe:2.3:o:juniper:junos:18.4:-:*:*:*:*:*:*18.4VulnerableJuniper
cpe:2.3:o:juniper:junos:18.4:r1:*:*:*:*:*:*18.4 r1VulnerableJuniper
cpe:2.3:o:juniper:junos:18.4:r1-s1:*:*:*:*:*:*18.4 r1-s1VulnerableJuniper
cpe:2.3:o:juniper:junos:18.4:r1-s2:*:*:*:*:*:*18.4 r1-s2VulnerableJuniper
cpe:2.3:o:juniper:junos:18.4:r1-s5:*:*:*:*:*:*18.4 r1-s5VulnerableJuniper
cpe:2.3:o:juniper:junos:19.1:-:*:*:*:*:*:*19.1VulnerableJuniper
cpe:2.3:o:juniper:junos:19.1:r1:*:*:*:*:*:*19.1 r1VulnerableJuniper
cpe:2.3:o:juniper:junos:19.1:r1-s1:*:*:*:*:*:*19.1 r1-s1VulnerableJuniper
cpe:2.3:o:juniper:junos:19.1:r1-s2:*:*:*:*:*:*19.1 r1-s2VulnerableJuniper
cpe:2.3:o:juniper:junos:19.1:r1-s3:*:*:*:*:*:*19.1 r1-s3VulnerableJuniper
cpe:2.3:a:juniper:vmx:-:*:*:*:*:*:*:*not specified by NVDRunning onJuniper
cpe:2.3:h:juniper:mx150:-:*:*:*:*:*:*:*not specified by NVDRunning onJuniper
  • cpe:2.3:o:juniper:junos:18.2:r2-s2:*:*:*:*:*:* Versions 18.2 r2-s2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.2:r2-s3:*:*:*:*:*:* Versions 18.2 r2-s3 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.2:r2-s4:*:*:*:*:*:* Versions 18.2 r2-s4 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.2:r2-s5:*:*:*:*:*:* Versions 18.2 r2-s5 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.2:r2-s6:*:*:*:*:*:* Versions 18.2 r2-s6 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.2x75:-:*:*:*:*:*:* Versions 18.2x75 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.2x75:d20:*:*:*:*:*:* Versions 18.2x75 d20 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.2x75:d30:*:*:*:*:*:* Versions 18.2x75 d30 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.2x75:d40:*:*:*:*:*:* Versions 18.2x75 d40 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.3:-:*:*:*:*:*:* Versions 18.3 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.3:r1:*:*:*:*:*:* Versions 18.3 r1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.3:r1-s1:*:*:*:*:*:* Versions 18.3 r1-s1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.3:r1-s2:*:*:*:*:*:* Versions 18.3 r1-s2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.3:r1-s3:*:*:*:*:*:* Versions 18.3 r1-s3 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.3:r1-s5:*:*:*:*:*:* Versions 18.3 r1-s5 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.3:r2:*:*:*:*:*:* Versions 18.3 r2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.3:r2-s1:*:*:*:*:*:* Versions 18.3 r2-s1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.3:r2-s2:*:*:*:*:*:* Versions 18.3 r2-s2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.4:-:*:*:*:*:*:* Versions 18.4 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.4:r1:*:*:*:*:*:* Versions 18.4 r1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.4:r1-s1:*:*:*:*:*:* Versions 18.4 r1-s1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.4:r1-s2:*:*:*:*:*:* Versions 18.4 r1-s2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:18.4:r1-s5:*:*:*:*:*:* Versions 18.4 r1-s5 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:19.1:-:*:*:*:*:*:* Versions 19.1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:19.1:r1:*:*:*:*:*:* Versions 19.1 r1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:19.1:r1-s1:*:*:*:*:*:* Versions 19.1 r1-s1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:19.1:r1-s2:*:*:*:*:*:* Versions 19.1 r1-s2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:19.1:r1-s3:*:*:*:*:*:* Versions 19.1 r1-s3 Vulnerable ·Juniper
  • cpe:2.3:a:juniper:vmx:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
  • cpe:2.3:h:juniper:mx150:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper

Remediation

  • Fix · CNA Junos OS (Juniper Networks) Fixed in 18.1R3, 18.2R3, 18.2X75-D60, 18.3R3, 18.4R2, 19.1R2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-1627
  2. 2026-10-03 Alias added: GHSA-fg22-5jgq-2wm6

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