CVE-2026-33801 PUBLISHED

Junos OS and Junos OS Evolved: When a specifically malformed BGP route update is received RPD crashes

Assigner: juniper
Reserved: 23.03.2026 Published: 09.07.2026 Updated: 10.07.2026

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 Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/RE:M
CVSS Score: 7.1

Product Status

Vendor Juniper Networks
Product Junos OS
Versions Default: unaffected
  • affected from 25.2 to 25.2R2 (excl.)
Vendor Juniper Networks
Product Junos OS Evolved
Versions Default: unaffected
  • affected from 25.2 to 25.2R2-EVO (excl.)

Exploits

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

Workarounds

There are no known workarounds for this issue.

Solutions

The following software releases have been updated to resolve this specific issue: Junos OS: 25.2R2, 25.4R1, and all subsequent releases. Junos OS Evolved: 25.2R2-EVO, 25.4R1-EVO, and all subsequent releases.

References

Problem Types

  • CWE-754 Improper Check for Unusual or Exceptional Conditions CWE