What’s Vulnerable › Vulnerabilities
CVE-2026-101948: Junos OS and Junos OS Evolved: A specific BGP FlowSpec update causes an rpd crash when BGP FlowSpec import policy is used
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% 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-476
Description
A NULL Pointer Dereference vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a remote unauthenticated BGP peer to cause a denial of service via a specific BGP FlowSpec update received by an affected BGP session.
Affected products
- Juniper Junos OS: from 25.2 before 25.2R2-S2; from 25.4 before 25.4R1-S3; from 26.2 before 26.2R1-S2 — fixed in 25.2R2-S2, 25.4R1-S3, 26.2R1-S2
- Juniper Networks Junos OS Evolved: from 25.2 before 25.2R2-S2-EVO; from 25.4 before 25.4R1-S3-EVO; from 26.2 before 26.2R1-S2-EVO; from 25.2X100 before 25.2X100-D35-EVO; from 25.4X300 before 25.4X300-D40-EVO; 23.4X100 — fixed in 25.2R2-S2-EVO, 25.2X100-D35-EVO, 25.4R1-S3-EVO, 25.4X300-D40-EVO, 26.2R1-S2-EVO
How to fix
Upgrade to a fixed version: Juniper Junos OS 25.2R2-S2, 25.4R1-S3, 26.2R1-S2; Juniper Networks Junos OS Evolved 25.2R2-S2-EVO, 25.2X100-D35-EVO, 25.4R1-S3-EVO, 25.4X300-D40-EVO. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-101948 or the next vulnerability affects your stack