A Junos device with VPLS routing-instances configured on one or more interfaces may be susceptible to an mbuf leak when processing a specific MPLS packet. Approximately 1 mbuf is leaked per each packet processed. The number of mbufs is platform dependent. The following command provides the number of mbufs that are currently in use and maximum number of mbufs that can be allocated on a platform: > show system buffers 2437/3143/5580 mbufs in use (current/cache/total) Once the device runs out of mbufs it will become inaccessible and a restart will be required. This issue only affects end devices, transit devices are not affected. Affected releases are Juniper Networks Junos OS with VPLS configured running: 12.1X46 versions prior to 12.1X46-D76; 12.3X48 versions prior to 12.3X48-D66, 12.3X48-D70; 14.1 versions prior to 14.1R9; 14.1X53 versions prior to 14.1X53-D47; 14.2 versions prior to 14.2R8; 15.1 versions prior to 15.1F2-S19, 15.1F6-S10, 15.1R4-S9, 15.1R5-S7, 15.1R6-S4, 15.1R7; 15.1X49 versions prior to 15.1X49-D131, 15.1X49-D140; 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; 15.1X53 versions prior to 15.1X53-D66 on QFX10; 16.1 versions prior to 16.1R3-S8, 16.1R4-S6, 16.1R5; 16.2 versions prior to 16.2R1-S6, 16.2R2-S5, 16.2R3; 17.1 versions prior to 17.1R1-S7, 17.1R2-S6, 17.1R3; 17.2 versions prior to 17.2R1-S5, 17.2R2.
| Software | From | Fixed in |
|---|---|---|
| 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 | 15.1x49 | 15.1x49.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-d120 | 15.1x49-d120.x |
| juniper / junos | 15.1x49-d130 | 15.1x49-d130.x |
| juniper / junos | 14.1-r1 | 14.1-r1.x |
| juniper / junos | 14.1-r4 | 14.1-r4.x |
| juniper / junos | 14.1 | 14.1.x |
| juniper / junos | 14.1-r3 | 14.1-r3.x |
| juniper / junos | 14.1-r8 | 14.1-r8.x |
| juniper / junos | 14.1-r7 | 14.1-r7.x |
| juniper / junos | 14.1-r6 | 14.1-r6.x |
| juniper / junos | 14.1-r2 | 14.1-r2.x |
| juniper / junos | 14.1-r5 | 14.1-r5.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-d42 | 14.1x53-d42.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-d43 | 14.1x53-d43.x |
| juniper / junos | 14.1x53 | 14.1x53.x |
| juniper / junos | 14.1x53-d44 | 14.1x53-d44.x |
| juniper / junos | 14.1x53-d26 | 14.1x53-d26.x |
| juniper / junos | 14.1x53-d46 | 14.1x53-d46.x |
| juniper / junos | 15.1x53-d10 | 15.1x53-d10.x |
| juniper / junos | 15.1x53-d20 | 15.1x53-d20.x |
| juniper / junos | 15.1x53-d30 | 15.1x53-d30.x |
| juniper / junos | 15.1x53 | 15.1x53.x |
| juniper / junos | 15.1x53-d33 | 15.1x53-d33.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-d21 | 15.1x53-d21.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 | 16.1-r1 | 16.1-r1.x |
| juniper / junos | 16.1-r4 | 16.1-r4.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 | 16.2-r3 | 16.2-r3.x |
| juniper / junos | 16.2-r2 | 16.2-r2.x |
| juniper / junos | 16.2-r1 | 16.2-r1.x |
| juniper / junos | 17.1-r3 | 17.1-r3.x |
| juniper / junos | 17.1-r1 | 17.1-r1.x |
| juniper / junos | 17.1-r2 | 17.1-r2.x |
| juniper / junos | 15.1-r3 | 15.1-r3.x |
| juniper / junos | 15.1-r6 | 15.1-r6.x |
| juniper / junos | 15.1-r4 | 15.1-r4.x |
| juniper / junos | 15.1-r2 | 15.1-r2.x |
| juniper / junos | 15.1-r1 | 15.1-r1.x |
| juniper / junos | 15.1 | 15.1.x |
| juniper / junos | 12.1x46-d60 | 12.1x46-d60.x |
| juniper / junos | 12.1x46-d30 | 12.1x46-d30.x |
| juniper / junos | 12.1x46-d45 | 12.1x46-d45.x |
| juniper / junos | 12.1x46-d50 | 12.1x46-d50.x |
| juniper / junos | 12.1x46-d25 | 12.1x46-d25.x |
| juniper / junos | 12.1x46 | 12.1x46.x |
| juniper / junos | 12.1x46-d65 | 12.1x46-d65.x |
| juniper / junos | 12.1x46-d35 | 12.1x46-d35.x |
| juniper / junos | 12.1x46-d20 | 12.1x46-d20.x |
| juniper / junos | 12.1x46-d40 | 12.1x46-d40.x |
| juniper / junos | 12.1x46-d15 | 12.1x46-d15.x |
| juniper / junos | 12.1x46-d10 | 12.1x46-d10.x |
| juniper / junos | 12.1x46-d55 | 12.1x46-d55.x |
| juniper / junos | 12.3x48-d10 | 12.3x48-d10.x |
| juniper / junos | 12.3x48-d15 | 12.3x48-d15.x |
| juniper / junos | 12.3x48-d35 | 12.3x48-d35.x |
| juniper / junos | 12.3x48-d50 | 12.3x48-d50.x |
| juniper / junos | 12.3x48-d30 | 12.3x48-d30.x |
| juniper / junos | 12.3x48 | 12.3x48.x |
| juniper / junos | 12.3x48-d25 | 12.3x48-d25.x |
| juniper / junos | 12.3x48-d45 | 12.3x48-d45.x |
| juniper / junos | 12.3x48-d55 | 12.3x48-d55.x |
| juniper / junos | 12.3x48-d20 | 12.3x48-d20.x |
| juniper / junos | 12.3x48-d40 | 12.3x48-d40.x |
| juniper / junos | 12.3x48-d60 | 12.3x48-d60.x |
| juniper / junos | 12.3x48-d65 | 12.3x48-d65.x |
| juniper / junos | 14.2-r1 | 14.2-r1.x |
| juniper / junos | 14.2-r2 | 14.2-r2.x |
| juniper / junos | 14.2-r3 | 14.2-r3.x |
| juniper / junos | 14.2-r6 | 14.2-r6.x |
| juniper / junos | 14.2 | 14.2.x |
| juniper / junos | 14.2-r7 | 14.2-r7.x |
| juniper / junos | 14.2-r4 | 14.2-r4.x |
| juniper / junos | 14.2-r5 | 14.2-r5.x |
| juniper / junos | 15.1-f1 | 15.1-f1.x |
| juniper / junos | 15.1-f4 | 15.1-f4.x |
| juniper / junos | 15.1-f6 | 15.1-f6.x |
| juniper / junos | 15.1-f2 | 15.1-f2.x |
| juniper / junos | 15.1-f3 | 15.1-f3.x |
| juniper / junos | 15.1x53-d62 | 15.1x53-d62.x |
| juniper / junos | 15.1x53-d63 | 15.1x53-d63.x |
| juniper / junos | 15.1x53-d64 | 15.1x53-d64.x |
| juniper / junos | 15.1x53-d210 | 15.1x53-d210.x |
| juniper / junos | 15.1x53-d60 | 15.1x53-d60.x |
| juniper / junos | 15.1x53-d61 | 15.1x53-d61.x |
| juniper / junos | 15.1x53-d230 | 15.1x53-d230.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-d470 | 15.1x53-d470.x |
| juniper / junos | 15.1x53-d233 | 15.1x53-d233.x |
| juniper / junos | 17.2-r1 | 17.2-r1.x |
| juniper / junos | 17.2-r2 | 17.2-r2.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.