Junos OS: MX Series: Receipt of malformed TCP traffic will cause a Denial of Service

Summary

An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS on MX Series allows a unauthenticated network-based attacker to cause an infinite loop, resulting in a Denial of Service (DoS). An attacker who sends malformed TCP traffic via an interface configured with PPPoE, causes an infinite loop on the respective PFE. This results in consuming all resources and a manual restart is needed to recover. This issue affects interfaces with PPPoE configured and tcp-mss enabled. This issue affects Juniper Networks Junos OS • All versions prior to 20.4R3-S7; • 21.1 version 21.1R1 and later versions; • 21.2 versions prior to 21.2R3-S6; • 21.3 versions prior to 21.3R3-S5; • 21.4 versions prior to 21.4R3-S3; • 22.1 versions prior to 22.1R3-S4; • 22.2 versions prior to 22.2R3; • 22.3 versions prior to 22.3R2-S2; • 22.4 versions prior to 22.4R2;

Timeline

1. Oct 12, 2023, 10:58 PM UTCCVE published
2. Sep 18, 2024, 5:54 PM UTCCISA SSVC assessment

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

3. Sep 18, 2024, 6:01 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  fixed in 20.4R3-S7; From 21.1R1; From 21.2 · fixed in 21.2R3-S6; From 21.3 · fixed in 21.3R3-S5; From 21.4 · fixed in 21.4R3-S3; From 22.1 · fixed in 22.1R3-S4; From 22.2 · fixed in 22.2R3; From 22.4 · fixed in 22.4R2

References 1