CVE-2026-33801

MediumCVSS 6.5/10Last modified Jul 13, 2026

Description

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.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-754

Affected software

Vendor	Product	Versions
Juniper Networks	Junos OS	>= 25.2, < 25.2R2
Juniper Networks	Junos OS Evolved	>= 25.2, < 25.2R2-EVO

References

https://supportportal.juniper.net/JSA110076Vendor Advisory

Timeline

Published: Jul 9, 2026
Last modified: Jul 13, 2026
NVD status: Analyzed

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