Junos OS: MX Series: In BBE configurations, receipt of a specific MPLS or IPv6 packet causes a Denial of Service

Description

Receipt of a specific MPLS or IPv6 packet on the core facing interface of an MX Series device configured for Broadband Edge (BBE) service may trigger a kernel crash (vmcore), causing the device to reboot. The issue is specific to the processing of packets destined to BBE clients connected to MX Series subscriber management platforms. This issue affects MX Series running Juniper Networks Junos OS: 17.2 versions starting from17.2R2-S6, 17.2R3 and later releases, prior to 17.2R3-S3; 17.3 versions starting from 17.3R2-S4, 17.3R3-S2 and later releases, prior to 17.3R2-S5, 17.3R3-S5; 17.4 versions starting from 17.4R2 and later releases, prior to 17.4R2-S7,17.4R3; 18.1 versions starting from 18.1R2-S3, 18.1R3 and later releases, prior to 18.1R3-S6; 18.2 versions starting from18.2R1-S1, 18.2R2 and later releases, prior to 18.2R3-S2; 18.2X75 versions prior to 18.2X75-D51, 18.2X75-D60; 18.3 versions prior to 18.3R3; 18.4 versions prior to 18.4R2; 19.1 versions prior to 19.1R1-S3, 19.1R2; 19.2 versions prior to 19.2R1-S2, 19.2R2. This issue does not affect Juniper Networks Junos OS versions prior to 17.2R2-S6.

Scores

EPSS (exploitation in 30 days)

1.3% · top 29% of all CVEs (6 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

• Denial of Service

Affected products

• Juniper Networks · Junos OS

  • unaffected unspecified – < 17.2R1
  • affected 17.2R2-S6, 17.2R3 – < 17.2*
  • affected 17.3R2-S4, 17.3R3-S2 – < 17.3*
  • affected 17.4R2 – < 17.4*
  • affected 18.1R2-S3, 18.1R3 – < 18.1*
  • affected 18.2R1-S1, 18.2R2 – < 18.2*
  • affected 18.2X75 – < 18.2X75-D51, 18.2X75-D60
  • affected 18.3 – < 18.3R3
  • affected 18.4 – < 18.4R2
  • affected 19.1 – < 19.1R1-S3, 19.1R2
  • affected 19.2 – < 19.2R1-S2, 19.2R2

What to do

Solution: The following software releases have been updated to resolve this specific issue: 17.2R3-S3, 17.3R2-S5, 17.3R3-S5, 17.4R2-S7, 17.4R3, 18.1R3-S6, 18.2R3-S2, 18.2X75-D51, 18.2X75-D60, 18.3R3, 18.4R2, 19.1R1-S3, 19.1R2, 19.2R1-S2, 19.2R2, 19.3R1, and all subsequent releases.

Workaround: There are no known workarounds for this issue.

Exploitation: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

References (1)

• https://kb.juniper.net/JSA10987 (opens in a new tab)x_refsource_CONFIRMx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2020-1608](https://trackcve.app/badge/CVE-2020-1608.svg)](https://trackcve.app/cve/CVE-2020-1608)

Record last updated 17 Sept 2024, 01:36 UTC.