CVE-2021-31365
Vulnérabilité moyenne dans Junos OS (Juniper Networks)
Description
An Uncontrolled Resource Consumption vulnerability in Juniper Networks Junos OS on EX2300, EX3400 and EX4300 Series platforms allows an adjacent attacker sending a stream of layer 2 frames will trigger an Aggregated Ethernet (AE) interface to go down and thereby causing a Denial of Service (DoS). By continuously sending a stream of specific layer 2 frames an attacker will sustain the Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS EX4300 Series All versions prior to 15.1R7-S7; 16.1 versions prior to 16.1R7-S8; 17.1 versions prior to 17.1R2-S12; 17.2 versions prior to 17.2R3-S4; 17.3 versions prior to 17.3R3-S8; 17.4 versions prior to 17.4R2-S10, 17.4R3-S2; 18.1 versions prior to 18.1R3-S10; 18.2 versions prior to 18.2R2-S7, 18.2R3-S3; 18.3 versions prior to 18.3R2-S4, 18.3R3-S2; 18.4 versions prior to 18.4R1-S7, 18.4R2-S4, 18.4R3-S1; 19.1 versions prior to 19.1R1-S5, 19.1R2-S1, 19.1R3; 19.2 versions prior to 19.2R1-S5, 19.2R2; 19.3 versions prior to 19.3R2-S2, 19.3R3; 19.4 versions prior to 19.4R1-S2, 19.4R2. Juniper Networks Junos OS EX3400 and EX4300-MP Series All versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R3-S7; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R2-S9, 18.4R3-S7; 19.1 versions prior to 19.1R2-S3, 19.1R3-S4; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R3-S1; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R2. Juniper Networks Junos OS EX2300 Series All versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R2-S9, 18.4R3-S9; 19.1 versions prior to 19.1R2-S3, 19.1R3-S6; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S7, 19.3R3-S3; 19.4 versions prior to 19.4R3-S5; 20.1 versions prior to 20.1R2-S2, 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R2.
Gravité et risque d'exploitation
CVE-2021-31365 obtient un score CVSS de 6.5/10, soit une gravité moyenne. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.40 %, ce qui la place devant 32.4 % des CVE référencées.
Que faire ?
- Vérifiez si Junos OS (versions 16.1, <18.1R3-S10, <18.4R2-S9, 18.4R3-S9, 19.2, <20.3R2, <19.1R2-S3, 19.1R3-S4, <19.4R3-S5, <20.1R2-S2, 20.1R3-S1, 19.3, <18.1R3-S12, <20.1R3, <18.4R2-S9, 18.4R3-S7, 20.1, <20.3R3-S1, <19.3R3-S1, <19.2R1-S7, 19.2R3-S3, 18.2, <18.3R2-S4, 18.3R3-S2, 20.3, <19.3R2-S7, 19.3R3-S3, 18.3, 19.1, <19.1R2-S3, 19.1R3-S6, <20.2R3, <16.1R7-S8, 20.4, 17.1, <19.3R2-S2, 19.3R3, <15.1R7-S7, 18.1, 17.4, <18.2R2-S7, 18.2R3-S3, 21.1, 18.4, <19.2R1-S5, 19.2R2, 17.3, <17.3R3-S8, 19.4, <17.2R3-S4, <20.4R2-S1, 20.4R3, <18.4R1-S7, 18.4R2-S4, 18.4R3-S1, <18.3R3-S5, <19.4R3-S1, <17.1R2-S12, <19.2R3-S1, <19.1R1-S5, 19.1R2-S1, 19.1R3, <20.2R3-S2, 20.2, <17.4R2-S10, 17.4R3-S2, <18.3R3-S4, <18.2R3-S7, 17.2, <19.4R1-S2, 19.4R2, <21.1R2) est présent sur votre parc.
- Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
- À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
- Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.