CVE-2021-0285
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2021
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
Junos OS: QFX5000 Series and EX4600 Series: Continuous traffic destined to a device configured with MC-LAG leading to nodes losing their control connection which can impact traffic
An uncontrolled resource consumption vulnerability in Juniper Networks Junos OS on QFX5000 Series and EX4600 Series switches allows an attacker sending large amounts of legitimate traffic destined to the device to cause Interchassis Control Protocol (ICCP) interruptions, leading to an unstable control connection between the Multi-Chassis Link Aggregation Group (MC-LAG) nodes which can in turn lead to traffic loss. Continued receipt of this amount of traffic will create a sustained Denial of Service (DoS) condition. An indication that the system could be impacted by this issue is the following log message: "DDOS_PROTOCOL_VIOLATION_SET: Warning: Host-bound traffic for protocol/exception LOCALNH:aggregate exceeded its allowed bandwidth at fpc <fpc number> for <n> times, started at <timestamp>" This issue affects Juniper Networks Junos OS on QFX5000 Series and EX4600 Series: 15.1 versions prior to 15.1R7-S9; 17.3 versions prior to 17.3R3-S11; 17.4 versions prior to 17.4R2-S13, 17.4R3-S5; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R2-S8, 18.4R3-S7; 19.1 versions prior to 19.1R3-S5; 19.2 versions prior to 19.2R1-S6, 19.2R3-S2; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R1-S4, 19.4R2-S4, 19.4R3-S2; 20.1 versions prior to 20.1R2-S2, 20.1R3; 20.2 versions prior to 20.2R2-S3, 20.2R3; 20.3 versions prior to 20.3R2; 20.4 versions prior to 20.4R1-S1, 20.4R2.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Junos OS
- Vendor
- Juniper Networks
- Product
- Junos OS
- Platforms
- QFX5000 Series and EX4600 Series
- Default status
Unknown
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 15.1 | affected | custom | 15.1R7-S9 | Unavailable | None listed |
| 17.3 | affected | custom | 17.3R3-S11 | Unavailable | None listed |
| 17.4 | affected | custom | 17.4R2-S13, 17.4R3-S5 | Unavailable | None listed |
| 18.3 | affected | custom | 18.3R3-S5 | Unavailable | None listed |
| 18.4 | affected | custom | 18.4R2-S8, 18.4R3-S7 | Unavailable | None listed |
| 19.1 | affected | custom | 19.1R3-S5 | Unavailable | None listed |
| 19.2 | affected | custom | 19.2R1-S6, 19.2R3-S2 | Unavailable | None listed |
| 19.3 | affected | custom | 19.3R2-S6, 19.3R3-S2 | Unavailable | None listed |
| 19.4 | affected | custom | 19.4R1-S4, 19.4R2-S4, 19.4R3-S2 | Unavailable | None listed |
| 20.1 | affected | custom | 20.1R2-S2, 20.1R3 | Unavailable | None listed |
| 20.2 | affected | custom | 20.2R2-S3, 20.2R3 | Unavailable | None listed |
| 20.3 | affected | custom | 20.3R2 | Unavailable | None listed |
| 20.4 | affected | custom | 20.4R1-S1, 20.4R2 | Unavailable | None listed |