An Improper Check or Handling of Exceptional Conditions vulnerability in the Layer-2 control protocols daemon (l2cpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a Denial of Service (DoS). When a malformed LLDP packet is received, l2cpd will crash and restart. The impact of the l2cpd crash is reinitialization of STP protocols (RSTP, MSTP or VSTP), and MVRP and ERP. Also, if any services depend on LLDP state (like PoE or VoIP device recognition), then these will also be affected. Continued receipt of such packets will lead to a sustained Denial of Service. This issue affects: Juniper Networks Junos OS 21.4 versions prior to 21.4R3-S3; 22.1 versions prior to 22.1R3-S3; 22.2 versions prior to 22.2R2-S1, 22.2R3; 22.3 versions prior t
The following software releases have been updated to resolve this specific issue: Junos OS: 21.4R3-S3, 22.1R3-S3, 22.2R2-S1, 22.2R3, 22.3R2, 22.4R1, and all subsequent releases. Junos OS Evolved: 21.4R3-S2-EVO, 22.1R3-S3-EVO, 22.2R2-S1-EVO, 22.2R3-EVO, 22.3R2-EVO, 22.4R1-EVO, and all subsequent releases;
There are no available workarounds for this issue. If LLDP and its services are not required, this issue can be mitigated by disabling LLDP.
| Product | Vulnerable range | Fixed version | Advisory |
|---|---|---|---|
| Juniper Networks Junos OS | >=21.4<21.4R3-S3 | 21.4R3-S3 | advisory ↗ |
| Juniper Networks Junos OS | >=22.1<22.1R3-S3 | 22.1R3-S3 | advisory ↗ |
| Juniper Networks Junos OS | >=22.2<22.2R2-S1, 22.2R3 | 22.2R2-S1, 22.2R3 | advisory ↗ |
| Juniper Networks Junos OS | >=22.3<22.3R2 | 22.3R2 | advisory ↗ |
| Juniper Networks Junos OS Evolved | >=21.4<21.4R3-S2-EVO | 21.4R3-S2-EVO | advisory ↗ |
| Juniper Networks Junos OS Evolved | >=22.1<22.1R3-S3-EVO | 22.1R3-S3-EVO | advisory ↗ |
| Juniper Networks Junos OS Evolved | >=22.2<22.2R2-S1-EVO, 22.2R3-EVO | 22.2R2-S1-EVO, 22.2R3-EVO | advisory ↗ |
| Juniper Networks Junos OS Evolved | >=22.3<22.3R2-EVO | 22.3R2-EVO | advisory ↗ |