Vulnerability Database

393,544

Total vulnerabilities in the database

CVE-2018-0020 — juniper / junos

Improper Input Validation

Junos OS may be impacted by the receipt of a malformed BGP UPDATE which can lead to a routing process daemon (rpd) crash and restart. Receipt of a repeated malformed BGP UPDATEs can result in an extended denial of service condition for the device. This malformed BGP UPDATE does not propagate to other BGP peers. Affected releases are Juniper Networks Junos OS: 14.1X53 versions prior to 14.1X53-D47; 15.1 versions prior to 15.1F6-S10, 15.1R4-S9, 15.1R6-S6, 15.1R7; 15.1X49 versions prior to 15.1X49-D130 on SRX; 15.1X53 versions prior to 15.1X53-D66 on QFX10K; 15.1X53 versions prior to 15.1X53-D58 on EX2300/EX3400; 15.1X53 versions prior to 15.1X53-D233 on QFX5200/QFX5110; 15.1X53 versions prior to 15.1X53-D471 on NFX; 16.1 versions prior to 16.1R3-S8, 16.1R4-S9, 16.1R5-S3, 16.1R6-S3, 16.1R7; 16.1X65 versions prior to 16.1X65-D47; 16.2 versions prior to 16.2R1-S6, 16.2R2-S5, 16.2R3; 17.1 versions prior to 17.1R2-S3, 17.1R3; 17.2 versions prior to 17.2R1-S3, 17.2R2-S1, 17.2R3; 17.2X75 versions prior to 17.2X75-D70; 13.2 versions above and including 13.2R1. Versions prior to 13.2R1 are not affected. Juniper SIRT is not aware of any malicious exploitation of this vulnerability. No other Juniper Networks products or platforms are affected by this issue.

  • Published: Apr 11, 2018
  • Updated: Oct 4, 2026
  • CVE: CVE-2018-0020
  • Severity: High
  • Exploit:
  • CISA KEV:

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: High
  • Score: 7.8
  • AV:N/AC:L/Au:N/C:N/I:N/A:C

CWEs:

Software Affected versions
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-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 = 14.1x53
juniper / junos = 14.1x53-d15
juniper / junos = 14.1x53-d16
juniper / junos = 14.1x53-d25
juniper / junos = 14.1x53-d26
juniper / junos = 14.1x53-d27
juniper / junos = 14.1x53-d30
juniper / junos = 14.1x53-d35
juniper / junos = 14.1x53-d40
juniper / junos = 14.1x53-d42
juniper / junos = 14.1x53-d43
juniper / junos = 14.1x53-d44
juniper / junos = 14.1x53-d45
juniper / junos = 14.1x53-d46
juniper / junos = 15.1x53
juniper / junos = 15.1x53-d10
juniper / junos = 15.1x53-d20
juniper / junos = 15.1x53-d21
juniper / junos = 15.1x53-d30
juniper / junos = 15.1x53-d32
juniper / junos = 15.1x53-d33
juniper / junos = 15.1x53-d34
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 = 16.1-r1
juniper / junos = 16.1-r2
juniper / junos = 16.1-r3
juniper / junos = 16.1-r4
juniper / junos = 16.1-r5
juniper / junos = 16.1-r6
juniper / junos = 16.2-r1
juniper / junos = 16.2-r2
juniper / junos = 16.2-r3
juniper / junos = 17.1-r1
juniper / junos = 17.1-r2
juniper / junos = 17.1-r3
juniper / junos = 15.1
juniper / junos = 15.1-r1
juniper / junos = 15.1-r2
juniper / junos = 15.1-r3
juniper / junos = 15.1-r4
juniper / junos = 15.1-r6
juniper / junos = 15.1-f1
juniper / junos = 15.1-f2
juniper / junos = 15.1-f3
juniper / junos = 15.1-f4
juniper / junos = 15.1-f6
juniper / junos = 15.1x53-d210
juniper / junos = 15.1x53-d230
juniper / junos = 15.1x53-d231
juniper / junos = 15.1x53-d232
juniper / junos = 15.1x53-d58
juniper / junos = 15.1x53-d60
juniper / junos = 15.1x53-d61
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-d233
juniper / junos = 15.1x53-d470
juniper / junos = 17.2-r1
juniper / junos = 17.2-r2
juniper / junos = 17.2-r3
juniper / junos = 16.1x65-d30
juniper / junos = 16.1x65-d35
juniper / junos = 16.1x65-d40
juniper / junos = 17.2x75

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.