CVE-2026-102087: Junos OS and Junos OS Evolved: If in a traffic engineering scenario a specific valid BGP-LS attribute is received rpd crashes

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-14 · updated 2026-10-15
Weakness: CWE-184

Description

An Incomplete List of Disallowed Inputs vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a Denial-of-Service (DoS). When in a BGP traffic engineering scenario a specific, valid, optional, non-transitive BGP update is received over an established BGP session, RPD crashes and automatically restarts, which leads to traffic impact until routing has reconverged. This issue affects: Junos OS: * All versions before 23.2R2-S6; * 23.4 versions before 23.4R2-S7; * 24.2 versions before 24.2R2-S4; * 24.4 versions before 24.4R2-S4; * 25.2 versions before 25.2R1-S2, 25.2R2; Junos OS Evolved: * All versions before 23.2R2-S6-EVO; * 23.4 versions before 23.4R2-S8.11-EVO; * 24.2 versions before 24.2R2-S4-EVO; * 24.4 versions before 24.4R2-S5-EVO; * 25.2 versions before 25.2R1-S2-EVO, 25.2R2-EVO;

Affected products

Juniper Junos OS: before 23.2R2-S6; from 23.4 before 23.4R2-S7; from 24.2 before 24.2R2-S4; from 24.4 before 24.4R2-S4; from 25.2 before 25.2R1-S2, 25.2R2 — fixed in 25.2R2, 23.2R2-S6, 23.4R2-S7, 24.2R2-S4, 24.4R2-S4, 25.2R1-S2
Juniper Networks Junos OS Evolved: before 23.2R2-S6-EVO; from 23.4 before 23.4R2-S8.11-EVO; from 24.2 before 24.2R2-S4-EVO; from 24.4 before 24.4R2-S5-EVO; from 25.2 before 25.2R1-S2-EVO, 25.2R2-EVO — fixed in 25.2R2-EVO, 23.2R2-S6-EVO, 23.4R2-S8.11-EVO, 24.2R2-S4-EVO, 24.4R2-S5-EVO, 25.2R1-S2-EVO

How to fix

Upgrade to a fixed version: Juniper Junos OS 25.2R2, 23.2R2-S6, 23.4R2-S7, 24.2R2-S4; Juniper Networks Junos OS Evolved 25.2R2-EVO, 23.2R2-S6-EVO, 23.4R2-S8.11-EVO, 24.2R2-S4-EVO. Check the vendor advisory for mitigations.

References

https://supportportal.juniper.net/JSA112168

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