CVE-2021-0237 is a Denial of Service (DoS) vulnerability affecting Juniper Networks EX4300-MP, EX4600, EX4650, and QFX5K Series devices running specific Junos OS versions when configured as a Virtual Chassis with a particular Layer 2 circuit. A remote attacker can trigger a crash and restart of the Packet Forwarding Engine manager (FXPC) process by sending specially crafted Layer 2 frames, leading to a sustained DoS condition. This vulnerability has a CVSS v3.1 score of 6.5 (Medium), indicating an attack vector requiring adjacent network access with low complexity and high impact on availability. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 15.1, < 15.1R7-S9CPE match | cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* | ||
>= 17.3, < 17.3R3-S11CPE match | cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* | ||
>= 18.2, < 18.2R3-S8CPE match | cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* | ||
>= 18.3, < 18.3R3-S4CPE match | cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* | ||
>= 19.1, < 19.1R3-S4CPE match | cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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