Junos OS: jdhcpd process crash during processing of specially crafted DHCPv6 message

Description

Receipt of a specially crafted DHCPv6 message destined to a Junos OS device configured as a DHCP server in a Broadband Edge (BBE) environment may result in a jdhcpd daemon crash. The daemon automatically restarts without intervention, but a continuous receipt of crafted DHCPv6 packets could leaded to an extended denial of service condition. This issue only affects Junos OS 15.1 and later. Earlier releases are unaffected by this issue. Devices are only vulnerable to the specially crafted DHCPv6 message if DHCP services are configured. Devices not configured to act as a DHCP server are not vulnerable to this issue. Affected releases are Juniper Networks Junos OS: 15.1 versions prior to 15.1R7-S2; 15.1X49 versions prior to 15.1X49-D160; 15.1X53 versions prior to 15.1X53-D235, 15.1X53-D495; 16.1 versions prior to 16.1R4-S11, 16.1R6-S6, 16.1R7-S2; 16.2 versions prior to 16.2R2-S7; 17.1 versions prior to 17.1R2-S9; 17.2 versions prior to 17.2R2-S6; 17.3 versions prior to 17.3R3-S1; 17.4 versions prior to 17.4R1-S5; 18.1 versions prior to 18.1R2-S3; 18.2 versions prior to 18.2R1-S2; 18.2X75 versions prior to 18.2X75-D20.

Scores

EPSS (exploitation in 30 days)

0.60% · top 51% of all CVEs (4 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
• CWE-20 (opens in a new tab)All about CWE-20 and its CVEs

Affected products

• Juniper Networks · Junos OS

  • affected 15.1 – < 15.1R7-S2
  • affected 15.1X49 – < 15.1X49-D160
  • affected 15.1X53 – < 15.1X53-D235, 15.1X53-D495
  • affected 16.1 – < 16.1R4-S11, 16.1R6-S6, 16.1R7-S2
  • affected 16.2 – < 16.2R2-S7
  • affected 17.1 – < 17.1R2-S9
  • affected 17.2 – < 17.2R2-S6
  • affected 17.3 – < 17.3R3-S1
  • affected 17.4 – < 17.4R1-S5
  • affected 18.1 – < 18.1R2-S3
  • affected 18.2 – < 18.2R1-S2
  • affected 18.2X75 – < 18.2X75-D20

What to do

Solution: The following software releases have been updated to resolve this specific issue: 15.1R7-S2, 15.1X49-D160, 15.1X53-D235, 15.1X53-D495, 16.1R4-S11, 16.1R6-S6, 16.1R7-S2, 16.2R2-S7, 16.2R3, 17.1R2-S9, 17.1R3, 17.2R2-S6, 17.2R3, 17.3R3-S1, 17.4R1-S5, 17.4R2, 18.1R2-S3, 18.1R3, 18.2R1-S2, 18.2R2, 18.2X75-D20, 18.3R1, and all subsequent releases.

Workaround: Disable DHCP services if they are not needed.

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

References (2)

• https://kb.juniper.net/JSA10889 (opens in a new tab)x_refsource_CONFIRMx_transferred
• 1041856 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_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-2018-0055](https://trackcve.app/badge/CVE-2018-0055.svg)](https://trackcve.app/cve/CVE-2018-0055)

Record last updated 16 Sept 2024, 19:14 UTC.