CVE-2021-0203
On Juniper Networks EX and QFX5K Series platforms configured with Redundant Trunk Group (RTG), Storm Control profile applied on the RTG interface might not take affect when it reaches the threshold condition. Storm Control enables the device to monitor traffic levels and to drop broadcast, multicast, and unknown unicast packets when a specified traffic level is exceeded, thus preventing packets from proliferating and degrading the LAN. Note: this issue does not affect EX2200, EX3300, EX4200, and EX9200 Series. This issue affects Juniper Networks Junos OS on EX Series and QFX5K Series: 15.1 versions prior to 15.1R7-S7; 16.1 versions prior to 16.1R7-S8; 17.2 versions prior to 17.2R3-S4; 17.3 versions prior to 17.3R3-S8; 17.4 versions prior to 17.4R2-S11, 17.4R3-S2; 18.1 versions prior to 18.1R3-S10; 18.2 versions prior to 18.2R3-S5; 18.3 versions prior to 18.3R2-S4, 18.3R3-S2; 18.4 versions prior to 18.4R2-S5, 18.4R3-S3; 19.1 versions prior to 19.1R2-S2, 19.1R3-S2; 19.2 versions prior to 19.2R1-S5, 19.2R2-S1, 19.2R3; 19.3 versions prior to 19.3R2-S4, 19.3R3; 19.4 versions prior to 19.4R1-S3, 19.4R2-S1, 19.4R3; 20.1 versions prior to 20.1R1-S2, 20.1R2.
Scoring
- Severity
- HIGH
- CVSS base score
- 8.6
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- EPSS probability
- 0.39%
- CWE
- CWE-794
- Published
- 2021-01-15
- Last modified
- 2026-03-13
Affected products
- Juniper Networks Junos OS
- Juniper Networks Junos OS
- Juniper Networks Junos OS
- Juniper Networks Junos OS
- Juniper Networks Junos OS
- Juniper Networks Junos OS
- Juniper Networks Junos OS
- Juniper Networks Junos OS
Weakness type
Related vulnerabilities
- CVE-2026-21876 — OWASP CRS has multipart bypass using multiple content-type parts
- CVE-2021-0233 — Junos OS: ACX500 Series, ACX4000 Series: Denial of Service due to FFEB crash while processing high rate of specific packets.
- CVE-2020-1665 — Junos OS: MX series/EX9200 Series: IPv6 DDoS protection does not work as expected.
- CVE-2019-0002 — Junos OS: EX2300 and EX3400 series: Certain stateless firewall filter rules might not take effect