CVE-2026-33801
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk20th percentile - higher than 20% of all known CVEs
Summary
An Improper Check for Unusual or Exceptional Conditions vulnerability in the routing protocol daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent, unauthenticated attacker to send a crafted non-inet/inet6 unicast BGP update over an established BGP session, causing an RPD crash and restart.
Risk Assessment
Successful exploitation results in a complete routing service outage until reconvergence, potentially causing significant network disruption and service unavailability.
Recommendation
Immediately upgrade Junos OS to version 25.2R2 or later, and Junos OS Evolved to version 25.2R2-EVO or later. If upgrade is not possible, restrict BGP sessions to trusted peers only.
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Original NVD description (English source)
An Improper Check for Unusual or Exceptional Conditions vulnerability in the routing protocol daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent, unauthenticated attacker sending a specific BGP update over an established BGP session to cause a Denial-of-Service (DoS). Upon receipt of a specifically malformed non-inet/inet6 unicast BGP update, an RPD crash and restart is triggered, which will cause a complete service outage until routing has reconverged. The rpd crash occurs before the update can be readvertised, so there is no downstream propagation. This issue affects: * Junos OS versions 25.2 before 25.2R2; * Junos OS Evolved versions 25.2 before 25.2R2-EVO. This issue doesn't affect Junos OS versions before 25.2R1 nor Junos OS Evolved versions before 25.2R1-EVO.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

