Junos OS and Junos OS Evolved: When jflow/sflow is configured continuous logical interface flaps causes rpd crash and restart

Summary

An Incorrect Calculation of Buffer Size vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated attacker to cause a memory corruption that leads to a rpd crash.  When the logical interface using a routing instance flaps continuously, specific updates are sent to the jflow/sflow modules. This results in memory corruption, leading to an rpd crash and restart.  Continued receipt of these specific updates will cause a sustained Denial of Service condition. This issue affects Junos OS: • All versions before 21.2R3-S9, • All versions of 21.4, • All versions of 22.2, • from 22.4 before 22.4R3-S7, • from 23.2 before 23.2R2-S3, • from 23.4 before 23.4R2-S4, • from 24.2 before 24.2R2. Junos OS Evolved:  • All versions of 21.2-EVO,  • All versions of 21.4-EVO,  • All versions of 22.2-EVO,  • from 22.4 before 22.4R3-S7-EVO,  • from 23.2 before 23.2R2-S3-EVO,  • from 23.4 before 23.4R2-S4-EVO,  • from 24.2 before 24.2R2-EVO.

Timeline

1. Jul 11, 2025, 2:42 PM UTCCVE published
2. Jul 11, 2025, 8:09 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Aug 20, 2025, 6:32 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  fixed in 21.2R3-S9; From 21.4; From 22.2; From 22.4 · fixed in 22.4R3-S7; From 23.2 · fixed in 23.2R2-S3; From 23.4 · fixed in 23.4R2-S4; From 24.2 · fixed in 24.2R2

• Juniper Networks Junos OS Evolved

  All versions; From 21.4; From 22.2; From 22.4 · fixed in 22.4R3-S7-EVO; From 23.2 · fixed in 23.2R2-S3-EVO; From 23.4 · fixed in 23.4R2-S4-EVO; From 24.2 · fixed in 24.2R2-EVO

References 1