Junos OS and Junos OS Evolved: Malformed BGP flowspec update causes RPD crash

Summary

An Improper Handling of Length Parameter Inconsistency vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a network based, unauthenticated attacker to cause an RPD crash leading to a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. Upon receipt of a malformed BGP flowspec update, RPD will crash resulting in a Denial of Service. This issue affects Juniper Networks Junos OS: All versions prior to 18.1R3-S11; 18.2 versions prior to 18.2R3-S6; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R3-S6; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2; 20.3 versions prior to 20.3R1-S1, 20.3R2; Juniper Networks Junos OS Evolved: All versions prior to 20.1R3-EVO; 20.2 versions prior to 20.2R2-EVO; 20.3 versions prior to 20.3R2-EVO;

Timeline

1. Apr 17, 2023, 12:00 AM UTCCVE published
2. Feb 6, 2025, 2:39 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Feb 6, 2025, 2:39 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  fixed in 18.1R3-S11; From 18.2 · fixed in 18.2R3-S6; From 18.3 · fixed in 18.3R3-S4; From 18.4 · fixed in 18.4R3-S6; From 19.1 · fixed in 19.1R3-S4; From 19.2 · fixed in 19.2R3-S1; From 19.3 · fixed in 19.3R3-S1; From 19.4 · fixed in 19.4R3; From 20.1 · fixed in 20.1R2; From 20.2 · fixed in 20.2R2

• Juniper Networks Junos OS Evolved

  fixed in 20.1R3-EVO; From 20.2 · fixed in 20.2R2-EVO; From 20.3 · fixed in 20.3R2-EVO

References 1