Junos OS: MX Series: An FPC crash might be seen due to mac-moves within the same bridge domain

Summary

An Improper Control of a Resource Through its Lifetime vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on MX Series allows an unauthenticated adjacent attacker to cause a Denial of Service (DoS). When there is a continuous mac move a memory corruption causes one or more FPCs to crash and reboot. These MAC moves can be between two local interfaces or between core/EVPN and local interface. The below error logs can be seen in PFE syslog when this issue happens: xss_event_handler(1071): EA[0:0]_PPE 46.xss[0] ADDR Error. ppe_error_interrupt(4298): EA[0:0]_PPE 46 Errors sync xtxn error xss_event_handler(1071): EA[0:0]_PPE 1.xss[0] ADDR Error. ppe_error_interrupt(4298): EA[0:0]_PPE 1 Errors sync xtxn error xss_event_handler(1071): EA[0:0]_PPE 2.xss[0] ADDR Error. This issue affects Juniper Networks Junos OS on MX Series: All versions prior to 15.1R7-S13; 19.1 versions prior to 19.1R3-S9; 19.2 versions prior to 19.2R3-S6; 19.3 versions prior to 19.3R3-S6; 19.4 versions prior to 19.4R2-S7, 19.4R3-S8; 20.1 version 20.1R1 and later versions; 20.2 versions prior to 20.2R3-S5; 20.3 versions prior to 20.3R3-S5; 20.4 versions prior to 20.4R3-S2; 21.1 versions prior to 21.1R3; 21.2 versions prior to 21.2R3; 21.3 versions prior to 21.3R2.

Timeline

1. Oct 18, 2022, 2:46 AM UTCCVE published
2. May 9, 2025, 3:13 PM UTCCISA SSVC assessment

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

3. May 9, 2025, 3:13 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  fixed in 15.1R7-S13; From 19.1 · fixed in 19.1R3-S9; From 19.2 · fixed in 19.2R3-S6; From 19.3 · fixed in 19.3R3-S6; From 20.1R1; From 20.2 · fixed in 20.2R3-S5; From 20.3 · fixed in 20.3R3-S5; From 20.4 · fixed in 20.4R3-S2; From 21.1 · fixed in 21.1R3; From 21.2 · fixed in 21.2R3; From 21.3 · fixed in 21.3R2

References 1