On EX4300, EX4600, QFX3500, and QFX5100 Series, a vulnerability in the IP firewall filter component may cause the firewall filter evaluation of certain packets to fail. This issue only affects firewall filter evaluation of certain packets destined to the device Routing Engine (RE). This issue does not affect the Layer 2 firewall filter evaluation nor does it affect the Layer 3 firewall filter evaluation destined to connected hosts. This issue may occur when evaluating both IPv4 or IPv6 packets. This issue affects Juniper Networks Junos OS: 14.1X53 versions prior to 14.1X53-D12 on QFX5100 Series and EX4600 Series; 14.1X53 versions prior to 14.1X53-D52 on QFX3500 Series; 14.1X53 versions prior to 14.1X53-D48 on EX4300 Series; 15.1 versions prior to 15.1R7-S3 on EX4300 Series; 16.1 versions prior to 16.1R7 on EX4300 Series; 17.1 versions prior to 17.1R3 on EX4300 Series; 17.2 versions prior to 17.2R3 on EX4300 Series; 17.3 versions prior to 17.3R2-S5, 17.3R3 on EX4300 Series; 17.4 versions prior to 17.4R2 on EX4300 Series; 18.1 versions prior to 18.1R3 on EX4300 Series; 18.2 versions prior to 18.2R2 on EX4300 Series.
| Software | From | Fixed in |
|---|---|---|
| juniper / junos | 14.1x53-d10 | 14.1x53-d10.x |
| juniper / junos | 14.1x53 | 14.1x53.x |
| juniper / junos | 14.1x53-d45 | 14.1x53-d45.x |
| juniper / junos | 14.1x53-d15 | 14.1x53-d15.x |
| juniper / junos | 14.1x53-d35 | 14.1x53-d35.x |
| juniper / junos | 14.1x53-d40 | 14.1x53-d40.x |
| juniper / junos | 14.1x53-d30 | 14.1x53-d30.x |
| juniper / junos | 14.1x53-d25 | 14.1x53-d25.x |
| juniper / junos | 14.1x53-d27 | 14.1x53-d27.x |
| juniper / junos | 14.1x53-d16 | 14.1x53-d16.x |
| juniper / junos | 14.1x53-d26 | 14.1x53-d26.x |
| juniper / junos | 14.1x53-d46 | 14.1x53-d46.x |
| juniper / junos | 14.1x53-d47 | 14.1x53-d47.x |
| juniper / junos | 14.1x53-d48 | 14.1x53-d48.x |
| juniper / junos | 14.1x53-d49 | 14.1x53-d49.x |
| juniper / junos | 14.1x53-d51 | 14.1x53-d51.x |
| juniper / junos | 15.1-r7-s1 | 15.1-r7-s1.x |
| juniper / junos | 15.1-f1 | 15.1-f1.x |
| juniper / junos | 15.1-r7-s2 | 15.1-r7-s2.x |
| juniper / junos | 15.1-f6-s3 | 15.1-f6-s3.x |
| juniper / junos | 15.1-r4-s9 | 15.1-r4-s9.x |
| juniper / junos | 15.1-r6-s6 | 15.1-r6-s6.x |
| juniper / junos | 15.1-f6 | 15.1-f6.x |
| juniper / junos | 15.1-f2 | 15.1-f2.x |
| juniper / junos | 15.1-r5 | 15.1-r5.x |
| juniper / junos | 15.1-r1 | 15.1-r1.x |
| juniper / junos | 15.1-f2-s1 | 15.1-f2-s1.x |
| juniper / junos | 15.1-f5 | 15.1-f5.x |
| juniper / junos | 15.1-a1 | 15.1-a1.x |
| juniper / junos | 15.1-f3 | 15.1-f3.x |
| juniper / junos | 15.1-r2 | 15.1-r2.x |
| juniper / junos | 15.1-f2-s2 | 15.1-f2-s2.x |
| juniper / junos | 15.1-r6 | 15.1-r6.x |
| juniper / junos | 15.1-f4 | 15.1-f4.x |
| juniper / junos | 15.1-r4 | 15.1-r4.x |
| juniper / junos | 15.1-f2-s4 | 15.1-f2-s4.x |
| juniper / junos | 15.1-r3 | 15.1-r3.x |
| juniper / junos | 15.1-f2-s3 | 15.1-f2-s3.x |
| juniper / junos | 15.1-f7 | 15.1-f7.x |
| juniper / junos | 16.1-r1 | 16.1-r1.x |
| juniper / junos | 16.1-r3 | 16.1-r3.x |
| juniper / junos | 16.1-r4 | 16.1-r4.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-r3-s10 | 16.1-r3-s10.x |
| juniper / junos | 16.1-r2 | 16.1-r2.x |
| juniper / junos | 16.1 | 16.1.x |
| juniper / junos | 17.1 | 17.1.x |
| juniper / junos | 17.1-r2-s10 | 17.1-r2-s10.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 | 17.1-r2-s7 | 17.1-r2-s7.x |
| juniper / junos | 17.1-r1 | 17.1-r1.x |
| juniper / junos | 17.2 | 17.2.x |
| juniper / junos | 17.2-r1-s2 | 17.2-r1-s2.x |
| juniper / junos | 17.2-r2-s6 | 17.2-r2-s6.x |
| juniper / junos | 17.2-r1-s7 | 17.2-r1-s7.x |
| juniper / junos | 17.2-r1-s4 | 17.2-r1-s4.x |
| juniper / junos | 17.2-r2-s7 | 17.2-r2-s7.x |
| juniper / junos | 17.2-r1-s8 | 17.2-r1-s8.x |
| juniper / junos | 17.3-r1-s1 | 17.3-r1-s1.x |
| juniper / junos | 17.3-r2-s4 | 17.3-r2-s4.x |
| juniper / junos | 17.3-r2-s1 | 17.3-r2-s1.x |
| juniper / junos | 17.3-r2-s2 | 17.3-r2-s2.x |
| juniper / junos | 17.3 | 17.3.x |
| juniper / junos | 17.3-r2 | 17.3-r2.x |
| juniper / junos | 17.4-r1 | 17.4-r1.x |
| juniper / junos | 17.4-r1-s7 | 17.4-r1-s7.x |
| juniper / junos | 17.4-r1-s4 | 17.4-r1-s4.x |
| juniper / junos | 17.4-r1-s6 | 17.4-r1-s6.x |
| juniper / junos | 17.4 | 17.4.x |
| juniper / junos | 17.4-r1-s2 | 17.4-r1-s2.x |
| juniper / junos | 17.4-r1-s1 | 17.4-r1-s1.x |
| juniper / junos | 18.1-r2 | 18.1-r2.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 | 18.1-r2-s2 | 18.1-r2-s2.x |
| juniper / junos | 18.2 | 18.2.x |
| juniper / junos | 18.2-r1-s4 | 18.2-r1-s4.x |
| juniper / junos | 18.2-r1-s5 | 18.2-r1-s5.x |
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.