CVE-2021-0289 is a Time-of-check Time-of-use (TOCTOU) race condition vulnerability in Juniper Networks Junos OS, affecting various versions across multiple platforms (excluding Junos OS Evolved). When a user-defined ARP Policer is configured on Aggregated Ethernet (AE) interface units, this flaw allows an attacker to bypass it, replacing it with a default ARP policer. The vulnerability has a CVSS score of 5.3 (Medium), indicating an adjacent network attack vector with high attack complexity and a high 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 |
|---|---|---|---|
>= 5.7, < 15.1CPE matchmatch criteria | cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* | ||
>= 15.2, < 18.4CPE matchmatch criteria | cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* | ||
5.6CPE matchmatch criteria | cpe:2.3:o:juniper:junos:5.6:r1:*:*:*:*:*:* | ||
18.4CPE matchmatch criteria | cpe:2.3:o:juniper:junos:18.4:-:*:*:*:*:*:* | ||
18.4CPE matchmatch criteria | cpe:2.3:o:juniper:junos:18.4:r1:*:*:*:*:*:* |
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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