Vulnerability Database

394,002

Total vulnerabilities in the database

CVE-2020-1628 — juniper / junos

Exposure of Sensitive Information to an Unauthorized Actor

Juniper Networks Junos OS uses the 128.0.0.0/2 subnet for internal communications between the RE and PFEs. It was discovered that packets utilizing these IP addresses may egress an EX4300 switch, leaking configuration information such as heartbeats, kernel versions, etc. out to the Internet, leading to an information exposure vulnerability. This issue affects Juniper Networks Junos OS: 14.1X53 versions prior to 14.1X53-D53 on EX4300; 15.1 versions prior to 15.1R7-S6 on EX4300; 15.1X49 versions prior to 15.1X49-D200, 15.1X49-D210 on EX4300; 16.1 versions prior to 16.1R7-S7 on EX4300; 17.1 versions prior to 17.1R2-S11, 17.1R3-S2 on EX4300; 17.2 versions prior to 17.2R3-S3 on EX4300; 17.3 versions prior to 17.3R2-S5, 17.3R3-S7 on EX4300; 17.4 versions prior to 17.4R2-S9, 17.4R3 on EX4300; 18.1 versions prior to 18.1R3-S8 on EX4300; 18.2 versions prior to 18.2R3-S2 on EX4300; 18.3 versions prior to 18.3R2-S3, 18.3R3, 18.3R3-S1 on EX4300; 18.4 versions prior to 18.4R1-S5, 18.4R2-S3, 18.4R3 on EX4300; 19.1 versions prior to 19.1R1-S4, 19.1R2 on EX4300; 19.2 versions prior to 19.2R1-S4, 19.2R2 on EX4300; 19.3 versions prior to 19.3R1-S1, 19.3R2 on EX4300.

  • Published: Apr 8, 2020
  • Updated: Oct 5, 2026
  • CVE: CVE-2020-1628
  • Severity: Medium
  • Exploit:
  • CISA KEV:

CVSS v3:

  • Severity: Medium
  • Score: 5.3
  • AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v2:

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

CWEs:

Software Affected versions
juniper / junos = 14.1x53
juniper / junos = 14.1x53-d10
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-d48
juniper / junos = 14.1x53-d50
juniper / junos = 14.1x53-d51
juniper / junos = 15.1
juniper / junos = 15.1-a1
juniper / junos = 15.1-f
juniper / junos = 15.1-f1
juniper / junos = 15.1-f2
juniper / junos = 15.1-f2-s1
juniper / junos = 15.1-f2-s2
juniper / junos = 15.1-f2-s3
juniper / junos = 15.1-f2-s4
juniper / junos = 15.1-f3
juniper / junos = 15.1-f4
juniper / junos = 15.1-f5
juniper / junos = 15.1-f5-s7
juniper / junos = 15.1-f6
juniper / junos = 15.1-f6-s1
juniper / junos = 15.1-f6-s12
juniper / junos = 15.1-f6-s2
juniper / junos = 15.1-f6-s3
juniper / junos = 15.1-f6-s4
juniper / junos = 15.1-f6-s7
juniper / junos = 15.1-f7
juniper / junos = 15.1-r1
juniper / junos = 15.1-r2
juniper / junos = 15.1-r3
juniper / junos = 15.1-r4
juniper / junos = 15.1-r4-s7
juniper / junos = 15.1-r4-s8
juniper / junos = 15.1-r4-s9
juniper / junos = 15.1-r5
juniper / junos = 15.1-r5-s1
juniper / junos = 15.1-r5-s5
juniper / junos = 15.1-r5-s6
juniper / junos = 15.1-r6
juniper / junos = 15.1-r6-s1
juniper / junos = 15.1-r6-s2
juniper / junos = 15.1-r6-s6
juniper / junos = 15.1-r7
juniper / junos = 15.1-r7-s1
juniper / junos = 15.1-r7-s2
juniper / junos = 15.1-r7-s3
juniper / junos = 15.1-r7-s4
juniper / junos = 15.1-r7-s5
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-d130
juniper / junos = 15.1x49-d140
juniper / junos = 15.1x49-d15
juniper / junos = 15.1x49-d150
juniper / junos = 15.1x49-d160
juniper / junos = 15.1x49-d170
juniper / junos = 15.1x49-d180
juniper / junos = 15.1x49-d190
juniper / junos = 15.1x49-d20
juniper / junos = 15.1x49-d25
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 = 16.1
juniper / junos = 16.1-r1
juniper / junos = 16.1-r2
juniper / junos = 16.1-r3
juniper / junos = 16.1-r3-s10
juniper / junos = 16.1-r3-s11
juniper / junos = 16.1-r4
juniper / junos = 16.1-r4-s12
juniper / junos = 16.1-r4-s2
juniper / junos = 16.1-r4-s3
juniper / junos = 16.1-r4-s4
juniper / junos = 16.1-r4-s6
juniper / junos = 16.1-r5
juniper / junos = 16.1-r5-s4
juniper / junos = 16.1-r6-s1
juniper / junos = 16.1-r6-s6
juniper / junos = 16.1-r7
juniper / junos = 16.1-r7-s2
juniper / junos = 16.1-r7-s3
juniper / junos = 16.1-r7-s4
juniper / junos = 16.1-r7-s5
juniper / junos = 16.1-r7-s6
juniper / junos = 17.1
juniper / junos = 17.1-r1
juniper / junos = 17.1-r2
juniper / junos = 17.1-r2-s1
juniper / junos = 17.1-r2-s10
juniper / junos = 17.1-r2-s2
juniper / junos = 17.1-r2-s3
juniper / junos = 17.1-r2-s4
juniper / junos = 17.1-r2-s5
juniper / junos = 17.1-r2-s6
juniper / junos = 17.1-r2-s7
juniper / junos = 17.1-r2-s8
juniper / junos = 17.1-r2-s9
juniper / junos = 17.1-r3
juniper / junos = 17.1-r3-s1
juniper / junos = 17.2
juniper / junos = 17.2-r1
juniper / junos = 17.2-r1-s1
juniper / junos = 17.2-r1-s2
juniper / junos = 17.2-r1-s3
juniper / junos = 17.2-r1-s4
juniper / junos = 17.2-r1-s5
juniper / junos = 17.2-r1-s7
juniper / junos = 17.2-r1-s8
juniper / junos = 17.2-r2
juniper / junos = 17.2-r2-s6
juniper / junos = 17.2-r2-s7
juniper / junos = 17.2-r3-s1
juniper / junos = 17.2-r3-s2
juniper / junos = 17.3
juniper / junos = 17.3-r1-s1
juniper / junos = 17.3-r2
juniper / junos = 17.3-r2-s1
juniper / junos = 17.3-r2-s2
juniper / junos = 17.3-r2-s3
juniper / junos = 17.3-r2-s4
juniper / junos = 17.3-r3
juniper / junos = 17.3-r3-s1
juniper / junos = 17.3-r3-s2
juniper / junos = 17.3-r3-s3
juniper / junos = 17.3-r3-s4
juniper / junos = 17.3-r3-s5
juniper / junos = 17.3-r3-s6
juniper / junos = 17.4
juniper / junos = 17.4-r1
juniper / junos = 17.4-r1-s1
juniper / junos = 17.4-r1-s2
juniper / junos = 17.4-r1-s4
juniper / junos = 17.4-r1-s5
juniper / junos = 17.4-r1-s6
juniper / junos = 17.4-r1-s7
juniper / junos = 17.4-r2
juniper / junos = 17.4-r2-s1
juniper / junos = 17.4-r2-s2
juniper / junos = 17.4-r2-s3
juniper / junos = 17.4-r2-s4
juniper / junos = 17.4-r2-s5
juniper / junos = 17.4-r2-s6
juniper / junos = 17.4-r2-s7
juniper / junos = 17.4-r2-s8
juniper / junos = 18.1
juniper / junos = 18.1-r2
juniper / junos = 18.1-r2-s1
juniper / junos = 18.1-r2-s2
juniper / junos = 18.1-r2-s4
juniper / junos = 18.1-r3
juniper / junos = 18.1-r3-s1
juniper / junos = 18.1-r3-s2
juniper / junos = 18.1-r3-s3
juniper / junos = 18.1-r3-s4
juniper / junos = 18.1-r3-s6
juniper / junos = 18.1-r3-s7
juniper / junos = 18.2
juniper / junos = 18.2-r1-s3
juniper / junos = 18.2-r1-s5
juniper / junos = 18.2-r2-s1
juniper / junos = 18.2-r2-s2
juniper / junos = 18.2-r2-s3
juniper / junos = 18.2-r2-s4
juniper / junos = 18.2-r2-s5
juniper / junos = 18.2-r2-s6
juniper / junos = 18.2-r3
juniper / junos = 18.2-r3-s1
juniper / junos = 18.3
juniper / junos = 18.3-r1
juniper / junos = 18.3-r1-s1
juniper / junos = 18.3-r1-s2
juniper / junos = 18.3-r1-s3
juniper / junos = 18.3-r1-s5
juniper / junos = 18.3-r2
juniper / junos = 18.3-r2-s1
juniper / junos = 18.3-r2-s2
juniper / junos = 18.3-r3
juniper / junos = 18.4
juniper / junos = 18.4-r1
juniper / junos = 18.4-r1-s1
juniper / junos = 18.4-r1-s2
juniper / junos = 18.4-r1-s3
juniper / junos = 18.4-r1-s4
juniper / junos = 18.4-r2
juniper / junos = 18.4-r2-s1
juniper / junos = 18.4-r2-s2
juniper / junos = 19.1
juniper / junos = 19.1-r1
juniper / junos = 19.1-r1-s1
juniper / junos = 19.1-r1-s2
juniper / junos = 19.1-r1-s3
juniper / junos = 19.2
juniper / junos = 19.2-r1
juniper / junos = 19.2-r1-s1
juniper / junos = 19.2-r1-s2
juniper / junos = 19.2-r1-s3
juniper / junos = 19.3-r1

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.