CVE-2021-0243 describes an Improper Handling of Unexpected Data vulnerability in the firewall policer of Juniper Networks Junos OS on EX4300 switches, specifically affecting IPv4 traffic. This flaw allows traffic to bypass configured policer limits on Layer 2 ports, potentially leading to a limited Denial of Service (DoS) condition. The vulnerability has a CVSS v3.1 score of 4.7 (Medium), indicating an attack vector of Adjacent Network, low attack complexity, and a low impact on availability. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 17.3R3-S10CPE match | cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* | ||
>= 17.4, < 17.4R3-S3CPE match | cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* | ||
>= 18.1, < 18.1R3-S11CPE match | cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* | ||
>= 18.2, < 18.2R3-S6CPE match | cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* | ||
>= 18.3, < 18.3R3-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:C/C:N/I:N/A:L
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