CVE-2025-21600
Vulnérabilité élevée dans Junos OS (Juniper Networks)
Description
An Out-of-Bounds Read vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, logically adjacent BGP peer sending a specifically malformed BGP packet to cause rpd to crash and restart, resulting in a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue only affects systems configured in either of two ways: * systems with BGP traceoptions enabled * systems with BGP family traffic-engineering (BGP-LS) configured and can be exploited from a directly connected and configured BGP peer. This issue affects iBGP and eBGP with any address family configured, and both IPv4 and IPv6 are affected by this vulnerability. This issue affects: Junos OS: * from 21.4 before 21.4R3-S9, * from 22.2 before 22.2R3-S5, * from 22.3 before 22.3R3-S4, * from 22.4 before 22.4R3-S5, * from 23.2 before 23.2R2-S3, * from 23.4 before 23.4R2-S3, * from 24.2 before 24.2R1-S2, 24.2R2; Junos OS Evolved: * from 21.4-EVO before 21.4R3-S9-EVO, * from 22.2-EVO before 22.2R3-S5-EVO, * from 22.3-EVO before 22.3R3-S4-EVO, * from 22.4-EVO before 22.4R3-S5-EVO, * from 23.2-EVO before 23.2R2-S3-EVO, * from 23.4-EVO before 23.4R2-S2-EVO, * from 24.2-EVO before 24.2R1-S2-EVO, 24.2R2-EVO. This issue does not affect versions of Junos OS prior to 21.3R1. This issue does not affect versions of Junos OS Evolved prior to 21.3R1-EVO. This is a similar, but different vulnerability than the issue reported as CVE-2024-39516.
Gravité et risque d'exploitation
CVE-2025-21600 obtient un score CVSS de 7.1/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.25 %, ce qui la place devant 15.5 % des CVE référencées.
Que faire ?
- Vérifiez si Junos OS (versions <23.4R2-S2-EVO, 23.2, <21.4R3-S9, <22.2R3-S5-EVO, <23.2R2-S3, <22.4R3-S5-EVO, 0, 22.4-EVO, <21.3R1-EVO, <22.3R3-S4, 21.4, <24.2R1-S2, 24.2R2, <22.2R3-S5, 22.2, <23.4R2-S3, 23.4, 21.4-EVO, 23.4-EVO, 22.2-EVO, 22.4, <24.2R1-S2-EVO, 24.2R2-EVO, <23.2R2-S3-EVO, <21.3R1, 22.3-EVO, 23.2-EVO, <22.4R3-S5, <21.4R3-S9-EVO, 24.2, <22.3R3-S4-EVO, 24.2-EVO, 22.3) 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.