By flooding a Juniper Networks router running Junos OS with specially crafted IPv6 traffic, all available resources can be consumed, leading to the inability to store next hop information for legitimate traffic. In extreme cases, the crafted IPv6 traffic may result in a total resource exhaustion and kernel panic. The issue is triggered by traffic destined to the router. Transit traffic does not trigger the vulnerability. This issue only affects devices with IPv6 enabled and configured. Devices not configured to process IPv6 traffic are unaffected by this vulnerability. This issue was found during internal product security testing. Juniper SIRT is not aware of any malicious exploitation of this vulnerability. Affected releases are Juniper Networks Junos OS 11.4 prior to 11.4R13-S3; 12.3 prior to 12.3R3-S4; 12.3X48 prior to 12.3X48-D30; 13.3 prior to 13.3R10, 13.3R4-S11; 14.1 prior to 14.1R2-S8, 14.1R4-S12, 14.1R8; 14.1X53 prior to 14.1X53-D28, 14.1X53-D40; 14.1X55 prior to 14.1X55-D35; 14.2 prior to 14.2R3-S10, 14.2R4-S7, 14.2R6; 15.1 prior to 15.1F2-S5, 15.1F5-S2, 15.1F6, 15.1R3; 15.1X49 prior to 15.1X49-D40; 15.1X53 prior to 15.1X53-D57, 15.1X53-D70.
| Software | From | Fixed in |
|---|---|---|
| juniper / junos | 11.4-r1 | 11.4-r1.x |
| juniper / junos | 11.4-r6 | 11.4-r6.x |
| juniper / junos | 11.4-r12 | 11.4-r12.x |
| juniper / junos | 11.4-r9 | 11.4-r9.x |
| juniper / junos | 11.4-r8 | 11.4-r8.x |
| juniper / junos | 11.4-r3 | 11.4-r3.x |
| juniper / junos | 11.4-r7 | 11.4-r7.x |
| juniper / junos | 11.4-r4 | 11.4-r4.x |
| juniper / junos | 11.4 | 11.4.x |
| juniper / junos | 11.4-r2 | 11.4-r2.x |
| juniper / junos | 11.4-r5 | 11.4-r5.x |
| juniper / junos | 11.4-r10 | 11.4-r10.x |
| juniper / junos | 11.4-r11 | 11.4-r11.x |
| juniper / junos | 11.4r13-s2 | 11.4r13-s2.x |
| juniper / junos | 12.3-r2 | 12.3-r2.x |
| juniper / junos | 12.3x48-d10 | 12.3x48-d10.x |
| juniper / junos | 12.3x48-d15 | 12.3x48-d15.x |
| juniper / junos | 12.3-r1 | 12.3-r1.x |
| juniper / junos | 12.3x48-d25 | 12.3x48-d25.x |
| juniper / junos | 12.3-r3 | 12.3-r3.x |
| juniper / junos | 12.3 | 12.3.x |
| juniper / junos | 13.3-r7 | 13.3-r7.x |
| juniper / junos | 13.3-r4 | 13.3-r4.x |
| juniper / junos | 13.3 | 13.3.x |
| juniper / junos | 13.3-r5 | 13.3-r5.x |
| juniper / junos | 13.3-r1 | 13.3-r1.x |
| juniper / junos | 13.3-r8 | 13.3-r8.x |
| juniper / junos | 13.3-r2-s2 | 13.3-r2-s2.x |
| juniper / junos | 13.3-r9 | 13.3-r9.x |
| juniper / junos | 13.3-r6 | 13.3-r6.x |
| juniper / junos | 13.3-r2 | 13.3-r2.x |
| juniper / junos | 13.3-r3 | 13.3-r3.x |
| juniper / junos | 13.3-r4-s11 | 13.3-r4-s11.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 | 14.1x53-d15 | 14.1x53-d15.x |
| juniper / junos | 14.1-r8 | 14.1-r8.x |
| juniper / junos | 14.1x53-d40 | 14.1x53-d40.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 | 14.1-r2 | 14.1-r2.x |
| juniper / junos | 14.1x55-d30 | 14.1x55-d30.x |
| juniper / junos | 14.1x55 | 14.1x55.x |
| juniper / junos | 14.1x53-d26 | 14.1x53-d26.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-r4 | 14.2-r4.x |
| juniper / junos | 15.1x49-d30 | 15.1x49-d30.x |
| juniper / junos | 15.1-f1 | 15.1-f1.x |
| juniper / junos | 15.1-r3 | 15.1-r3.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 | 15.1-f6 | 15.1-f6.x |
| juniper / junos | 15.1-f2 | 15.1-f2.x |
| juniper / junos | 15.1x49-d35 | 15.1x49-d35.x |
| juniper / junos | 15.1x53-d32 | 15.1x53-d32.x |
| juniper / junos | 15.1x53-d34 | 15.1x53-d34.x |
| juniper / junos | 15.1x53-d21 | 15.1x53-d21.x |
| juniper / junos | 15.1-f5 | 15.1-f5.x |
| juniper / junos | 15.1x49-d20 | 15.1x49-d20.x |
| juniper / junos | 15.1x49-d10 | 15.1x49-d10.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 |
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.