An Improper Input Validation vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker, sending a specific genuine BGP packet in an already established BGP session to reset only that session causing a Denial of Service (DoS). An attacker repeatedly sending the packet will sustain the Denial of Service (DoS).This issue affects Junos OS: * 25.2 versions before 25.2R2 This issue does not affect Junos OS versions before 25.2R1. This issue affects Junos OS Evolved: * 25.2-EVO versions before 25.2R2-EVO This issue does not affect Junos OS Evolved versions before 25.2R1-EVO. eBGP and iBGP are affected. IPv4 and IPv6 are affected.
Fix
Patch, vendor advisory and mitigation references on NVD 1
- https://kb.juniper.net/JSA107850 Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.1 · juniperNVD modified 2026-10-26 22:10
Affected (CPE criteria) 8
cpe:2.3:o:juniper:junos:25.2:-:*:*:*:*:*:*cpe:2.3:o:juniper:junos:25.2:r1:*:*:*:*:*:*cpe:2.3:o:juniper:junos:25.2:r1-s1:*:*:*:*:*:*cpe:2.3:o:juniper:junos:25.2:r1-s2:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:25.2:-:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:25.2:r1:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:25.2:r1-s1:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:25.2:r1-s2:*:*:*:*:*:*