Junos OS and Junos OS Evolved: A vulnerability in JDHCPD allows an attacker to send crafted IPv4 packets may take over the code execution of the JDHCPD process.

Description

When a device using Juniper Network's Dynamic Host Configuration Protocol Daemon (JDHCPD) process on Junos OS or Junos OS Evolved which is configured in relay mode it vulnerable to an attacker sending crafted IPv4 packets who may remotely take over the code execution of the JDHDCP process. This issue affect IPv4 JDHCPD services. This issue affects: Juniper Networks Junos OS: 15.1 versions prior to 15.1R7-S6; 15.1X49 versions prior to 15.1X49-D200; 15.1X53 versions prior to 15.1X53-D592; 16.1 versions prior to 16.1R7-S6; 16.2 versions prior to 16.2R2-S11; 17.1 versions prior to 17.1R2-S11, 17.1R3-S1; 17.2 versions prior to 17.2R2-S8, 17.2R3-S3; 17.3 versions prior to 17.3R3-S6; 17.4 versions prior to 17.4R2-S7, 17.4R3; 18.1 versions prior to 18.1R3-S8; 18.2 versions prior to 18.2R3-S2; 18.2X75 versions prior to 18.2X75-D60; 18.3 versions prior to 18.3R1-S6, 18.3R2-S2, 18.3R3; 18.4 versions prior to 18.4R1-S5, 18.4R2-S3, 18.4R3; 19.1 versions prior to 19.1R1-S3, 19.1R2; 19.2 versions prior to 19.2R1-S3, 19.2R2*. and All versions prior to 19.3R1 on Junos OS Evolved. This issue do not affect versions of Junos OS prior to 15.1, or JDHCPD operating as a local server in non-relay mode.

Scores

EPSS (exploitation in 30 days)

0.79% · top 44% of all CVEs (6 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.

Weakness

• Denial of Service
• Code Execution of Process
• CWE-416 Use After Free (opens in a new tab)All about CWE-416 and its CVEs
• CWE-78 (opens in a new tab)All about CWE-78 and its CVEs

Affected products

• Juniper Networks · Junos OS

  • affected 15.1 – < 15.1R7-S6
  • affected 15.1X49 – < 15.1X49-D200
  • affected 15.1X53 – < 15.1X53-D592
  • affected 16.1 – < 16.1R7-S6
  • affected 16.2 – < 16.2R2-S11
  • affected 17.1 – < 17.1R2-S11, 17.1R3-S1
  • affected 17.2 – < 17.2R2-S8, 17.2R3-S3
  • affected 17.3 – < 17.3R3-S6
  • affected 17.4 – < 17.4R2-S7, 17.4R3
  • affected 18.1 – < 18.1R3-S8
  • affected 18.2 – < 18.2R3-S2
  • affected 18.3 – < 18.3R1-S6, 18.3R2-S2, 18.3R3
  • affected 18.4 – < 18.4R1-S5, 18.4R2-S3, 18.4R3
  • affected 19.1 – < 19.1R1-S3, 19.1R2
  • affected 19.2 – < 19.2R1-S3, 19.2R2
  • affected 19.3 – < 19.3R1, 19.3R2
  • affected 18.2X75 – < 18.2X75-D60

• Juniper Networks · Junos OS Evolved

  • affected unspecified – < 19.3R1

What to do

Solution: The following software releases have been updated to resolve this specific issue: Junos OS: 15.1R7-S6, 15.1X49-D200, 15.1X53-D592, 16.1R7-S6, 16.2R2-S11, 17.1R2-S11, 17.1R3-S1, 17.2R2-S8, 17.2R3-S3, 17.3R3-S6, 17.4R2-S7, 17.4R3, 18.1R3-S8, 18.2R3-S2, 18.2X75-D60, 18.3R1-S6, 18.3R2-S2, 18.3R3, 18.4R1-S5, 18.4R2-S3, 18.4R3, 19.1R1-S3, 19.1R2, 19.2R1-S3, 19.2R2*, 19.3R1, and all subsequent releases. Junos OS Evolved: 19.3R1, and all subsequent releases. *pending publication

Workaround: If JDHCPD is not needed then disable the service in the device configuration. There are no other viable workarounds for this issue.

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

References (2)

• https://kb.juniper.net/JSA10981 (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://prsearch.juniper.net/InfoCenter/index?page=prcontent&id=PR1449353 (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-2020-1602](https://trackcve.app/badge/CVE-2020-1602.svg)](https://trackcve.app/cve/CVE-2020-1602)

Record last updated 16 Sept 2024, 16:43 UTC.