Junos OS: MX Series: jdhcpd crash when receiving a specific crafted DHCP response message

Description

When an MX Series Broadband Remote Access Server (BRAS) is configured as a Broadband Network Gateway (BNG) with DHCPv6 enabled, jdhcpd might crash when receiving a specific crafted DHCP response message on a subscriber interface. The daemon automatically restarts without intervention, but continuous receipt of specific crafted DHCP messages will repeatedly crash jdhcpd, leading to an extended Denial of Service (DoS) condition. This issue only affects systems configured with DHCPv6 enabled. DHCPv4 is unaffected by this issue. This issue affects Juniper Networks Junos OS: 15.1 versions prior to 15.1R7-S5 on MX Series; 16.1 versions prior to 16.1R7-S5 on MX Series; 16.2 versions prior to 16.2R2-S10 on MX Series; 17.1 versions prior to 17.1R3-S1 on MX Series; 17.2 versions prior to 17.2R3-S2 on MX Series; 17.3 versions prior to 17.3R3-S6 on MX Series; 17.4 versions prior to 17.4R2-S5, 17.4R3 on MX Series; 18.1 versions prior to 18.1R3-S6 on MX Series; 18.2 versions prior to 18.2R2-S4, 18.2R3 on MX Series; 18.2X75 versions prior to 18.2X75-D50 on MX Series; 18.3 versions prior to 18.3R1-S5, 18.3R3 on MX Series; 18.4 versions prior to 18.4R2 on MX Series; 19.1 versions prior to 19.1R1-S2, 19.1R2 on MX Series.

Scores

EPSS (exploitation in 30 days)

1.3% · top 30% of all CVEs (5 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.

Weakness

• Denial of Service (DoS)

Affected products

• Juniper Networks · Junos OS

  • affected 15.1 – < 15.1R7-S5
  • affected 16.1 – < 16.1R7-S5
  • affected 16.2 – < 16.2R2-S10
  • affected 17.1 – < 17.1R3-S1
  • affected 17.2 – < 17.2R3-S2
  • affected 17.3 – < 17.3R3-S6
  • affected 17.4 – < 17.4R2-S5, 17.4R3
  • affected 18.1 – < 18.1R3-S6
  • affected 18.2 – < 18.2R2-S4, 18.2R3
  • affected 18.2X75 – < 18.2X75-D50
  • affected 18.3 – < 18.3R1-S5, 18.3R3
  • affected 18.4 – < 18.4R2
  • affected 19.1 – < 19.1R1-S2, 19.1R2

What to do

Solution: The following software releases have been updated to resolve this specific issue: 15.1R7-S5, 16.1R7-S5, 16.2R2-S10, 17.1R3-S1, 17.2R3-S2, 17.3R3-S6, 17.4R2-S5, 17.4R3, 18.1R3-S6, 18.2R2-S4, 18.2R3, 18.2X75-D50, 18.3R1-S5, 18.3R3, 18.4R2, 19.1R1-S2, 19.1R2, 19.2R1, and all subsequent releases.

Workaround: There are no viable workarounds for this issue.

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

References (1)

• https://kb.juniper.net/JSA10962 (opens in a new tab)x_refsource_MISCx_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-2019-0063](https://trackcve.app/badge/CVE-2019-0063.svg)](https://trackcve.app/cve/CVE-2019-0063)

Record last updated 17 Sept 2024, 00:06 UTC.