A vulnerability in the BGP FlowSpec implementation may cause a Juniper Networks Junos OS device to terminate an established BGP session upon receiving a specific BGP FlowSpec advertisement. The BGP NOTIFICATION message that terminates an established BGP session is sent toward the peer device that originally sent the specific BGP FlowSpec advertisement. This specific BGP FlowSpec advertisement received from a BGP peer might get propagated from a Junos OS device running the fixed release to another device that is vulnerable causing BGP session termination downstream. This issue affects IPv4 and IPv6 BGP FlowSpec deployment. This issue affects Juniper Networks Junos OS: 12.3; 12.3X48 on SRX Series; 14.1X53 on EX and QFX Series; 15.1 versions prior to 15.1R7-S5; 15.1F versions prior to 15.1F6-S13; 15.1X49 versions prior to 15.1X49-D180 on SRX Series; 15.1X53 versions prior to 15.1X53-D238 on QFX5200/QFX5110; 15.1X53 versions prior to 15.1X53-D497 on NFX Series; 15.1X53 versions prior to 15.1X53-D592 on EX2300/EX3400; 16.1 versions prior to 16.1R7-S7; 17.1 versions prior to 17.1R2-S12, 17.1R3; 17.2 versions prior to 17.2R2-S7, 17.2R3; 17.2X75 versions prior to 17.2X75-D102, 17.2X75-D110, 17.2X75-D44; 17.3 versions prior to 17.3R2-S5, 17.3R3-S5; 17.4 versions prior to 17.4R1-S8, 17.4R2; 18.1 versions prior to 18.1R2-S4, 18.1R3; 18.2X75 versions prior to 18.2X75-D20.
| Software | From | Fixed in |
|---|---|---|
| juniper / junos | 17.1-r3 | 17.1-r3.x |
| juniper / junos | 15.1-r7 | 15.1-r7.x |
| juniper / junos | 15.1-f1 | 15.1-f1.x |
| juniper / junos | 15.1-f6-s4 | 15.1-f6-s4.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 | 15.1-r3 | 15.1-r3.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-f5-s7 | 15.1-f5-s7.x |
| juniper / junos | 15.1-f6-s7 | 15.1-f6-s7.x |
| juniper / junos | 15.1-f6 | 15.1-f6.x |
| juniper / junos | 15.1-f2 | 15.1-f2.x |
| juniper / junos | 17.2-r1 | 17.2-r1.x |
| juniper / junos | 16.1-r4-s4 | 16.1-r4-s4.x |
| juniper / junos | 15.1-f3 | 15.1-f3.x |
| juniper / junos | 15.1-r2 | 15.1-r2.x |
| juniper / junos | 16.1-r4 | 16.1-r4.x |
| juniper / junos | 17.1-r1 | 17.1-r1.x |
| juniper / junos | 15.1-r4-s7 | 15.1-r4-s7.x |
| juniper / junos | 15.1-r4-s8 | 15.1-r4-s8.x |
| juniper / junos | 16.1-r4-s3 | 16.1-r4-s3.x |
| juniper / junos | 15.1-r5-s5 | 15.1-r5-s5.x |
| juniper / junos | 17.1-r2 | 17.1-r2.x |
| juniper / junos | 15.1-r6-s1 | 15.1-r6-s1.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-r5-s1 | 15.1-r5-s1.x |
| juniper / junos | 17.2-r2 | 17.2-r2.x |
| juniper / junos | 15.1-f5 | 15.1-f5.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 | 15.1-r5-s6 | 15.1-r5-s6.x |
| juniper / junos | 15.1-r6-s2 | 15.1-r6-s2.x |
| juniper / junos | 17.2-r1-s2 | 17.2-r1-s2.x |
| juniper / junos | 17.2x75-d50 | 17.2x75-d50.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 | 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 | 15.1-f | 15.1-f.x |
| juniper / junos | 17.3-r2-s2 | 17.3-r2-s2.x |
| juniper / junos | 15.1-f6-s3 | 15.1-f6-s3.x |
| juniper / junos | 15.1-r7-s1 | 15.1-r7-s1.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 | 15.1-r7-s2 | 15.1-r7-s2.x |
| juniper / junos | 15.1-r7-s3 | 15.1-r7-s3.x |
| juniper / junos | 17.2x75-d70 | 17.2x75-d70.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 | 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 | 17.2x75-d92 | 17.2x75-d92.x |
| juniper / junos | 17.3-r2-s1 | 17.3-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 | 15.1-f6-s2 | 15.1-f6-s2.x |
| juniper / junos | 15.1-f6-s1 | 15.1-f6-s1.x |
| juniper / junos | 17.4 | 17.4.x |
| juniper / junos | 18.1 | 18.1.x |
| juniper / junos | 18.1-r2-s1 | 18.1-r2-s1.x |
| juniper / junos | 15.1 | 15.1.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 | 17.1-r2-s9 | 17.1-r2-s9.x |
| juniper / junos | 17.4-r1-s5 | 17.4-r1-s5.x |
| juniper / junos | 18.2x75-d10 | 18.2x75-d10.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 | 12.3 | 12.3.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 | 17.3-r3-s4 | 17.3-r3-s4.x |
| juniper / junos | 17.4-r1-s6 | 17.4-r1-s6.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 | 17.1-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 | 15.1-r7-s4 | 15.1-r7-s4.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 | 15.1-f6-s12 | 15.1-f6-s12.x |
| juniper / junos | 16.1-r7-s5 | 16.1-r7-s5.x |
| juniper / junos | 17.2-r2-s10 | 17.2-r2-s10.x |
| juniper / junos | 17.2-r2-s9 | 17.2-r2-s9.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 | 17.2-r2-s11 | 17.2-r2-s11.x |
| juniper / junos | 17.1-r2-s11 | 17.1-r2-s11.x |
| juniper / junos | 12.3x48-d10 | 12.3x48-d10.x |
| juniper / junos | 15.1x49-d110 | 15.1x49-d110.x |
| juniper / junos | 15.1x49-d60 | 15.1x49-d60.x |
| juniper / junos | 15.1x49-d100 | 15.1x49-d100.x |
| juniper / junos | 15.1x49-d35 | 15.1x49-d35.x |
| juniper / junos | 15.1x49-d45 | 15.1x49-d45.x |
| juniper / junos | 15.1x49-d75 | 15.1x49-d75.x |
| juniper / junos | 15.1x49-d65 | 15.1x49-d65.x |
| juniper / junos | 15.1x49-d90 | 15.1x49-d90.x |
| juniper / junos | 15.1x49-d40 | 15.1x49-d40.x |
| juniper / junos | 15.1x49-d20 | 15.1x49-d20.x |
| juniper / junos | 15.1x49-d10 | 15.1x49-d10.x |
| juniper / junos | 15.1x49-d55 | 15.1x49-d55.x |
| juniper / junos | 15.1x49-d15 | 15.1x49-d15.x |
| juniper / junos | 15.1x49-d25 | 15.1x49-d25.x |
| juniper / junos | 15.1x49-d120 | 15.1x49-d120.x |
| juniper / junos | 15.1x49-d130 | 15.1x49-d130.x |
| juniper / junos | 15.1x49-d140 | 15.1x49-d140.x |
| juniper / junos | 15.1x49-d160 | 15.1x49-d160.x |
| juniper / junos | 15.1x49-d150 | 15.1x49-d150.x |
| juniper / junos | 15.1x49 | 15.1x49.x |
| juniper / junos | 15.1x49-d170 | 15.1x49-d170.x |
| juniper / junos | 15.1x49-d50 | 15.1x49-d50.x |
| juniper / junos | 15.1x49-d30 | 15.1x49-d30.x |
| juniper / junos | 15.1x49-d70 | 15.1x49-d70.x |
| juniper / junos | 15.1x49-d80 | 15.1x49-d80.x |
| juniper / junos | 14.1x53 | 14.1x53.x |
| juniper / junos | 15.1x53-d47 | 15.1x53-d47.x |
| juniper / junos | 15.1x53-d10 | 15.1x53-d10.x |
| juniper / junos | 15.1x53-d40 | 15.1x53-d40.x |
| juniper / junos | 15.1x53-d62 | 15.1x53-d62.x |
| juniper / junos | 15.1x53-d20 | 15.1x53-d20.x |
| juniper / junos | 15.1x53-d30 | 15.1x53-d30.x |
| juniper / junos | 15.1x53-d33 | 15.1x53-d33.x |
| juniper / junos | 15.1x53-d25 | 15.1x53-d25.x |
| juniper / junos | 15.1x53-d63 | 15.1x53-d63.x |
| juniper / junos | 15.1x53-d32 | 15.1x53-d32.x |
| juniper / junos | 15.1x53-d57 | 15.1x53-d57.x |
| juniper / junos | 15.1x53-d34 | 15.1x53-d34.x |
| juniper / junos | 15.1x53-d64 | 15.1x53-d64.x |
| juniper / junos | 15.1x53-d210 | 15.1x53-d210.x |
| juniper / junos | 15.1x53-d70 | 15.1x53-d70.x |
| juniper / junos | 15.1x53-d21 | 15.1x53-d21.x |
| juniper / junos | 15.1x53-d60 | 15.1x53-d60.x |
| juniper / junos | 15.1x53-d48 | 15.1x53-d48.x |
| juniper / junos | 15.1x53-d45 | 15.1x53-d45.x |
| juniper / junos | 15.1x53-d61 | 15.1x53-d61.x |
| juniper / junos | 15.1x53-d230 | 15.1x53-d230.x |
| juniper / junos | 15.1x53-d50 | 15.1x53-d50.x |
| juniper / junos | 15.1x53-d51 | 15.1x53-d51.x |
| juniper / junos | 15.1x53-d52 | 15.1x53-d52.x |
| juniper / junos | 15.1x53-d55 | 15.1x53-d55.x |
| juniper / junos | 15.1x53-d65 | 15.1x53-d65.x |
| juniper / junos | 15.1x53-d231 | 15.1x53-d231.x |
| juniper / junos | 15.1x53-d58 | 15.1x53-d58.x |
| juniper / junos | 15.1x53-d66 | 15.1x53-d66.x |
| juniper / junos | 15.1x53-d232 | 15.1x53-d232.x |
| juniper / junos | 15.1x53-d233 | 15.1x53-d233.x |
| juniper / junos | 15.1x53-d56 | 15.1x53-d56.x |
| juniper / junos | 15.1x53-d59 | 15.1x53-d59.x |
| juniper / junos | 15.1x53-d67 | 15.1x53-d67.x |
| juniper / junos | 15.1x53-d31 | 15.1x53-d31.x |
| juniper / junos | 15.1x53-d234 | 15.1x53-d234.x |
| juniper / junos | 15.1x53-d68 | 15.1x53-d68.x |
| juniper / junos | 15.1x53-d237 | 15.1x53-d237.x |
| juniper / junos | 15.1x53-d236 | 15.1x53-d236.x |
| juniper / junos | 15.1x53-d235 | 15.1x53-d235.x |
| juniper / junos | 15.1x53 | 15.1x53.x |
| juniper / junos | 15.1x53-d69 | 15.1x53-d69.x |
| juniper / junos | 15.1x53-d470 | 15.1x53-d470.x |
| juniper / junos | 15.1x53-d495 | 15.1x53-d495.x |
| juniper / junos | 15.1x53-d590 | 15.1x53-d590.x |
| juniper / junos | 15.1x53-d591 | 15.1x53-d591.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.