How should we interpret CVSS severity scores?

CVSS estimates technical severity, but it does not automatically equal business risk. Prioritize using context like internet exposure, asset criticality, known exploitation, 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.

Vulnerability Database

Q: What is a Vulnerability (CVE) and why does it matter?

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.

Q: What's the difference between a vulnerability, an exploit, and a zero-day?

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. Risk increases sharply when exploitation becomes reliable or widespread.

Q: Why do vulnerabilities keep reappearing in our environment?

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.

Q: How do we prioritize remediation without burning out the team?

Use a 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 so remediation is steady, not reactive.

Q: How can SynScan help reduce vulnerability risk over time?

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.

346,508

Total vulnerabilities in the database

CVE-2020-1625 — juniper / junos

Missing Release of Memory after Effective Lifetime

The kernel memory usage represented as "temp" via 'show system virtual-memory' may constantly increase when Integrated Routing and Bridging (IRB) is configured with multiple underlay physical interfaces, and one interface flaps. This memory leak can affect running daemons (processes), leading to an extended Denial of Service (DoS) condition. Usage of "temp" virtual memory, shown here by a constantly increasing value of outstanding Requests, can be monitored by executing the 'show system virtual-memory' command as shown below: user@junos> show system virtual-memory |match "fpc|type|temp" fpc0: -------------------------------------------------------------------------- Type InUse MemUse HighUse Requests Size(s) temp 2023 431K - 10551 16,32,64,128,256,512,1024,2048,4096,65536,262144,1048576,2097152,4194304,8388608 fpc1: -------------------------------------------------------------------------- Type InUse MemUse HighUse Requests Size(s) temp 2020 431K - 6460 16,32,64,128,256,512,1024,2048,4096,65536,262144,1048576,2097152,4194304,8388608 user@junos> show system virtual-memory |match "fpc|type|temp" fpc0: -------------------------------------------------------------------------- Type InUse MemUse HighUse Requests Size(s) temp 2023 431K - 16101 16,32,64,128,256,512,1024,2048,4096,65536,262144,1048576,2097152,4194304,8388608 fpc1: -------------------------------------------------------------------------- Type InUse MemUse HighUse Requests Size(s) temp 2020 431K - 6665 16,32,64,128,256,512,1024,2048,4096,65536,262144,1048576,2097152,4194304,8388608 user@junos> show system virtual-memory |match "fpc|type|temp" fpc0: -------------------------------------------------------------------------- Type InUse MemUse HighUse Requests Size(s) temp 2023 431K - 21867 16,32,64,128,256,512,1024,2048,4096,65536,262144,1048576,2097152,4194304,8388608 fpc1: -------------------------------------------------------------------------- Type InUse MemUse HighUse Requests Size(s) temp 2020 431K - 6858 16,32,64,128,256,512,1024,2048,4096,65536,262144,1048576,2097152,4194304,8388608 This issue affects Juniper Networks Junos OS: 16.1 versions prior to 16.1R7-S6; 17.1 versions prior to 17.1R2-S11, 17.1R3-S1; 17.2 versions prior to 17.2R2-S8, 17.2R3-S3; 17.2X75 versions prior to 17.2X75-D44; 17.3 versions prior to 17.3R2-S5, 17.3R3-S6; 17.4 versions prior to 17.4R2-S5, 17.4R3; 18.1 versions prior to 18.1R3-S7; 18.2 versions prior to 18.2R2-S5, 18.2R3; 18.2X75 versions prior to 18.2X75-D33, 18.2X75-D411, 18.2X75-D420, 18.2X75-D60; 18.3 versions prior to 18.3R1-S5, 18.3R2-S3, 18.3R3; 18.4 versions prior to 18.4R2-S2, 18.4R3; 19.1 versions prior to 19.1R1-S3, 19.1R2; 19.2 versions prior to 19.2R1-S3, 19.2R2. This issue does not affect Juniper Networks Junos OS 12.3 and 15.1.

Published: Apr 8, 2020
Updated: Nov 9, 2025
CVE: CVE-2020-1625
Severity: Medium
Exploit:

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: 3.3
AV:A/AC:L/Au:N/C:N/I:N/A:P

CWEs:

Affected Software
References

Software	From	Fixed in
juniper / junos	17.1-r3	17.1-r3.x
juniper / junos	16.1-r1	16.1-r1.x
juniper / junos	17.2-r1	17.2-r1.x
juniper / junos	16.1-r4-s4	16.1-r4-s4.x
juniper / junos	16.1-r4	16.1-r4.x
juniper / junos	17.1-r1	17.1-r1.x
juniper / junos	16.1-r4-s3	16.1-r4-s3.x
juniper / junos	17.1-r2	17.1-r2.x
juniper / junos	17.2-r2	17.2-r2.x
juniper / junos	16.1-r3	16.1-r3.x
juniper / junos	16.1-r5	16.1-r5.x
juniper / junos	16.1-r2	16.1-r2.x
juniper / junos	17.2-r1-s2	17.2-r1-s2.x
juniper / junos	16.1-r5-s4	16.1-r5-s4.x
juniper / junos	16.1-r6-s1	16.1-r6-s1.x
juniper / junos	16.1-r7	16.1-r7.x
juniper / junos	17.1-r2-s7	17.1-r2-s7.x
juniper / junos	17.3-r2	17.3-r2.x
juniper / junos	17.4-r1	17.4-r1.x
juniper / junos	17.4-r2	17.4-r2.x
juniper / junos	17.3-r2-s2	17.3-r2-s2.x
juniper / junos	18.1-r3	18.1-r3.x
juniper / junos	17.2-r2-s6	17.2-r2-s6.x
juniper / junos	16.1-r6-s6	16.1-r6-s6.x
juniper / junos	18.1-r2	18.1-r2.x
juniper / junos	16.1-r3-s10	16.1-r3-s10.x
juniper / junos	17.2-r1-s7	17.2-r1-s7.x
juniper / junos	17.4-r2-s2	17.4-r2-s2.x
juniper / junos	17.2-r1-s1	17.2-r1-s1.x
juniper / junos	17.2-r1-s3	17.2-r1-s3.x
juniper / junos	17.2-r1-s5	17.2-r1-s5.x
juniper / junos	17.4-r1-s1	17.4-r1-s1.x
juniper / junos	18.2	18.2.x
juniper / junos	18.2-r2-s1	18.2-r2-s1.x
juniper / junos	18.2-r2-s2	18.2-r2-s2.x
juniper / junos	18.2-r1-s3	18.2-r1-s3.x
juniper / junos	18.3-r1-s1	18.3-r1-s1.x
juniper / junos	17.2-r1-s4	17.2-r1-s4.x
juniper / junos	17.3-r3-s1	17.3-r3-s1.x
juniper / junos	17.3-r3-s2	17.3-r3-s2.x
juniper / junos	17.4-r1-s2	17.4-r1-s2.x
juniper / junos	17.3-r2-s1	17.3-r2-s1.x
juniper / junos	18.3-r2	18.3-r2.x
juniper / junos	18.3-r1	18.3-r1.x
juniper / junos	17.4-r2-s1	17.4-r2-s1.x
juniper / junos	17.1-r2-s1	17.1-r2-s1.x
juniper / junos	17.1-r2-s2	17.1-r2-s2.x
juniper / junos	17.1-r2-s3	17.1-r2-s3.x
juniper / junos	17.1-r2-s4	17.1-r2-s4.x
juniper / junos	17.1-r2-s5	17.1-r2-s5.x
juniper / junos	17.1-r2-s6	17.1-r2-s6.x
juniper / junos	18.1-r2-s2	18.1-r2-s2.x
juniper / junos	18.4-r1	18.4-r1.x
juniper / junos	17.4	17.4.x
juniper / junos	18.1-r3-s4	18.1-r3-s4.x
juniper / junos	18.1-r3-s3	18.1-r3-s3.x
juniper / junos	18.1-r3-s2	18.1-r3-s2.x
juniper / junos	18.1	18.1.x
juniper / junos	18.1-r2-s1	18.1-r2-s1.x
juniper / junos	18.1-r2-s4	18.1-r2-s4.x
juniper / junos	16.1	16.1.x
juniper / junos	17.1	17.1.x
juniper / junos	17.2	17.2.x
juniper / junos	17.3	17.3.x
juniper / junos	17.2x75	17.2x75.x
juniper / junos	18.2x75	18.2x75.x
juniper / junos	18.2x75-d20	18.2x75-d20.x
juniper / junos	18.3-r1-s2	18.3-r1-s2.x
juniper / junos	18.3	18.3.x
juniper / junos	18.4	18.4.x
juniper / junos	17.1-r2-s9	17.1-r2-s9.x
juniper / junos	17.4-r1-s5	17.4-r1-s5.x
juniper / junos	18.1-r3-s1	18.1-r3-s1.x
juniper / junos	17.3-r3	17.3-r3.x
juniper / junos	17.3-r3-s3	17.3-r3-s3.x
juniper / junos	17.1-r2-s10	17.1-r2-s10.x
juniper / junos	17.4-r1-s7	17.4-r1-s7.x
juniper / junos	16.1-r3-s11	16.1-r3-s11.x
juniper / junos	17.4-r1-s4	17.4-r1-s4.x
juniper / junos	18.4-r1-s1	18.4-r1-s1.x
juniper / junos	17.3-r3-s4	17.3-r3-s4.x
juniper / junos	17.3-r3-s5	17.3-r3-s5.x
juniper / junos	17.4-r2-s3	17.4-r2-s3.x
juniper / junos	17.4-r2-s4	17.4-r2-s4.x
juniper / junos	17.4-r1-s6	17.4-r1-s6.x
juniper / junos	18.3-r1-s3	18.3-r1-s3.x
juniper / junos	17.2-r2-s7	17.2-r2-s7.x
juniper / junos	18.2-r2-s3	18.2-r2-s3.x
juniper / junos	18.2-r2-s4	18.2-r2-s4.x
juniper / junos	17.2-r3-s1	17.2-r3-s1.x
juniper / junos	18.2-r1-s5	18.2-r1-s5.x
juniper / junos	17.2-r1-s8	17.2-r1-s8.x
juniper / junos	18.4-r1-s2	18.4-r1-s2.x
juniper / junos	19.1-r1	19.1-r1.x
juniper / junos	19.1	19.1.x
juniper / junos	17.1-r2-s8	17.1-r2-s8.x
juniper / junos	17.3-r2-s3	17.3-r2-s3.x
juniper / junos	16.1-r7-s3	16.1-r7-s3.x
juniper / junos	16.1-r7-s4	16.1-r7-s4.x
juniper / junos	17.2-r3-s2	17.2-r3-s2.x
juniper / junos	19.2-r1	19.2-r1.x
juniper / junos	18.4-r2	18.4-r2.x
juniper / junos	18.1-r3-s6	18.1-r3-s6.x
juniper / junos	19.1-r1-s1	19.1-r1-s1.x
juniper / junos	19.1-r1-s2	19.1-r1-s2.x
juniper / junos	18.2x75-d40	18.2x75-d40.x
juniper / junos	17.3-r1-s1	17.3-r1-s1.x
juniper / junos	16.1-r7-s2	16.1-r7-s2.x
juniper / junos	18.4-r1-s5	18.4-r1-s5.x
juniper / junos	19.2-r1-s1	19.2-r1-s1.x
juniper / junos	19.2-r1-s2	19.2-r1-s2.x
juniper / junos	18.3-r1-s5	18.3-r1-s5.x
juniper / junos	16.1-r7-s5	16.1-r7-s5.x
juniper / junos	16.1-r4-s12	16.1-r4-s12.x
juniper / junos	16.1-r4-s6	16.1-r4-s6.x
juniper / junos	16.1-r4-s2	16.1-r4-s2.x
juniper / junos	17.3-r2-s4	17.3-r2-s4.x
juniper / junos	18.3-r2-s1	18.3-r2-s1.x
juniper / junos	18.3-r2-s2	18.3-r2-s2.x
juniper / junos	18.4-r2-s1	18.4-r2-s1.x
juniper / junos	19.2	19.2.x
juniper / junos	18.2x75-d30	18.2x75-d30.x

https://kb.juniper.net/JSA11004

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Frequently Asked Questions

What is a Vulnerability (CVE) and why does it matter?

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.