Vulnerability Database

346,508

Total vulnerabilities in the database

CVE-2019-0037 — juniper / junos

In a Dynamic Host Configuration Protocol version 6 (DHCPv6) environment, the jdhcpd daemon may crash and restart upon receipt of certain DHCPv6 solicit messages received from a DHCPv6 client. By continuously sending the same crafted packet, an attacker can repeatedly crash the jdhcpd process causing a sustained Denial of Service (DoS) to both IPv4 and IPv6 clients. Affected releases are Juniper Networks Junos OS: 15.1 versions prior to 15.1F6-S12, 15.1R7-S3; 15.1X49 versions prior to 15.1X49-D171, 15.1X49-D180; 15.1X53 versions prior to 15.1X53-D236, 15.1X53-D496; 16.1 versions prior to 16.1R3-S10, 16.1R7-S4; 16.2 versions prior to 16.2R2-S8; 17.1 versions prior to 17.1R2-S10, 17.1R3; 17.2 versions prior to 17.2R1-S8, 17.2R3-S1; 17.3 versions prior to 17.3R3-S3; 17.4 versions prior to 17.4R1-S6, 17.4R2-S3; 18.1 versions prior to 18.1R2-S4, 18.1R3-S2; 18.2 versions prior to 18.2R2; 18.2X75 versions prior to 18.2X75-D30; 18.3 versions prior to 18.3R1-S2. This issue does not affect Junos OS releases prior to 15.1.

  • Published: Apr 10, 2019
  • Updated: Nov 9, 2025
  • CVE: CVE-2019-0037
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 7.5
  • AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v2:

  • Severity: Medium
  • Score: 5
  • AV:N/AC:L/Au:N/C:N/I:N/A:P

No CWE or OWASP classifications available.

Software From Fixed in
juniper / junos 15.1-r7 15.1-r7.x
juniper / junos 15.1-r3 15.1-r3.x
juniper / junos 15.1-r6 15.1-r6.x
juniper / junos 15.1-r4 15.1-r4.x
juniper / junos 15.1-r2 15.1-r2.x
juniper / junos 15.1-r5 15.1-r5.x
juniper / junos 15.1-r1 15.1-r1.x
juniper / junos 15.1x49-d30 15.1x49-d30.x
juniper / junos 15.1x49-d60 15.1x49-d60.x
juniper / junos 15.1x49-d140 15.1x49-d140.x
juniper / junos 15.1x49-d150 15.1x49-d150.x
juniper / junos 15.1x49-d160 15.1x49-d160.x
juniper / junos 15.1x53-d50 15.1x53-d50.x
juniper / junos 15.1x53-d51 15.1x53-d51.x
juniper / junos 15.1x53-d52 15.1x53-d52.x
juniper / junos 15.1x53-d55 15.1x53-d55.x
juniper / junos 15.1x53-d57 15.1x53-d57.x
juniper / junos 15.1x53-d58 15.1x53-d58.x
juniper / junos 15.1x53-d59 15.1x53-d59.x
juniper / junos 16-r2 16-r2.x
juniper / junos 16-r3 16-r3.x
juniper / junos 16-r4 16-r4.x
juniper / junos 16-r5 16-r5.x
juniper / junos 16-r6 16-r6.x
juniper / junos 16-r7 16-r7.x
juniper / junos 16.2-r2 16.2-r2.x
juniper / junos 16.2-r1 16.2-r1.x
juniper / junos 16.2-r2-s7 16.2-r2-s7.x
juniper / junos 17.1-r1 17.1-r1.x
juniper / junos 17.1-r2 17.1-r2.x
juniper / junos 17.1-r2-s9 17.1-r2-s9.x
juniper / junos 17.2-r1 17.2-r1.x
juniper / junos 17.2-r2 17.2-r2.x
juniper / junos 17.2-r3 17.2-r3.x
juniper / junos 17.2-r1-s7 17.2-r1-s7.x
juniper / junos 17.3-r1 17.3-r1.x
juniper / junos 17.3-r2 17.3-r2.x
juniper / junos 17.3-r3 17.3-r3.x
juniper / junos 17.3-r3-s2 17.3-r3-s2.x
juniper / junos 17.4-r1 17.4-r1.x
juniper / junos 17.4-r2 17.4-r2.x
juniper / junos 17.4-r1-s5 17.4-r1-s5.x
juniper / junos 18.1-r1 18.1-r1.x
juniper / junos 18.1-r3 18.1-r3.x
juniper / junos 18.1-r2 18.1-r2.x
juniper / junos 18.1-r3-s1 18.1-r3-s1.x
juniper / junos 18.2-r1 18.2-r1.x
juniper / junos 18.2x75-d10 18.2x75-d10.x
juniper / junos 18.3-r1-s1 18.3-r1-s1.x
juniper / junos 18.3-r1 18.3-r1.x

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.