Vulnerability Database

393,557

Total vulnerabilities in the database

CVE-2018-0055 — juniper / junos

Improper Input Validation

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.

  • Published: Oct 10, 2018
  • Updated: Oct 4, 2026
  • CVE: CVE-2018-0055
  • Severity: Medium
  • Exploit:
  • CISA KEV:

CVSS v3:

  • Severity: Medium
  • Score: 6.5
  • AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v2:

  • Severity: Low
  • Score: 2.9
  • AV:A/AC:M/Au:N/C:N/I:N/A:P

CWEs:

Software Affected versions
juniper / junos = 15.1
juniper / junos = 15.1-f2
juniper / junos = 15.1-f3
juniper / junos = 15.1-f4
juniper / junos = 15.1-f5
juniper / junos = 15.1-f6
juniper / junos = 15.1-f7
juniper / junos = 15.1-r1
juniper / junos = 15.1-r2
juniper / junos = 15.1-r3
juniper / junos = 15.1-r6
juniper / junos = 15.1x49
juniper / junos = 15.1x49-d10
juniper / junos = 15.1x49-d100
juniper / junos = 15.1x49-d110
juniper / junos = 15.1x49-d120
juniper / junos = 15.1x49-d140
juniper / junos = 15.1x49-d20
juniper / junos = 15.1x49-d30
juniper / junos = 15.1x49-d35
juniper / junos = 15.1x49-d40
juniper / junos = 15.1x49-d45
juniper / junos = 15.1x49-d50
juniper / junos = 15.1x49-d55
juniper / junos = 15.1x49-d60
juniper / junos = 15.1x49-d65
juniper / junos = 15.1x49-d70
juniper / junos = 15.1x49-d75
juniper / junos = 15.1x49-d80
juniper / junos = 15.1x49-d90
juniper / junos = 15.1x53
juniper / junos = 15.1x53-d10
juniper / junos = 15.1x53-d20
juniper / junos = 15.1x53-d21
juniper / junos = 15.1x53-d210
juniper / junos = 15.1x53-d230
juniper / junos = 15.1x53-d231
juniper / junos = 15.1x53-d232
juniper / junos = 15.1x53-d233
juniper / junos = 15.1x53-d30
juniper / junos = 15.1x53-d32
juniper / junos = 15.1x53-d33
juniper / junos = 15.1x53-d34
juniper / junos = 15.1x53-d40
juniper / junos = 15.1x53-d45
juniper / junos = 15.1x53-d50
juniper / junos = 15.1x53-d51
juniper / junos = 15.1x53-d52
juniper / junos = 15.1x53-d55
juniper / junos = 15.1x53-d57
juniper / junos = 15.1x53-d58
juniper / junos = 15.1x53-d59
juniper / junos = 15.1x53-d60
juniper / junos = 15.1x53-d62
juniper / junos = 15.1x53-d63
juniper / junos = 15.1x53-d64
juniper / junos = 15.1x53-d65
juniper / junos = 15.1x53-d66
juniper / junos = 15.1x53-d67
juniper / junos = 16.1
juniper / junos = 16.1-r1
juniper / junos = 16.1-r2
juniper / junos = 16.1-r3
juniper / junos = 16.2
juniper / junos = 16.2-r1
juniper / junos = 17.1
juniper / junos = 17.1-r1
juniper / junos = 17.2
juniper / junos = 17.2-r1
juniper / junos = 17.3
juniper / junos = 17.3-r1
juniper / junos = 17.3-r2
juniper / junos = 17.4
juniper / junos = 18.2x75
juniper / junos = 18.2

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.