title: Junos: EX Series PFE and MX MPC7E/8E/9E PFE crash when fetching interface stats with 'extended-statistics' enabled
description: If extended statistics are enabled via 'set chassis extended-statistics', when executing any operation that fetches interface statistics, including but not limited to SNMP GET requests, the pfem process or the FPC may crash and restart. Repeated crashes of PFE processing can result in an extended denial of service condition. This issue only affects the following platforms: (1) EX2200, EX3300, XRE200 (2) MX Series routers with MPC7E/8E/9E PFEs installed, and only if 'extended-statistics' are enabled under the [edit chassis] configuration. Affected releases are Juniper Networks Junos OS 14.1 prior to 14.1R8-S5, 14.1R9 on MX Series; 14.1X53 prior to 14.1X53-D46, 14.1X53-D50 on EX2200, EX3300, XRE200; 14.2 prior to 14.2R7-S9, 14.2R8 on MX Series; 15.1 prior to 15.1F5-S8, 15.1F6-S8, 15.1R5-S3, 15.1R6 on MX Series; 16.1 prior to 16.1R4-S5, 16.1R5, 16.1R6 on MX Series; 16.1X65 prior to 16.1X65-D45 on EX2200, EX3300, XRE200; 16.2 prior to 16.2R2-S1, 16.2R3 on MX Series; 17.1 prior to 17.1R2-S2, 17.1R3 on MX Series; 17.2 prior to 17.2R1-S3, 17.2R2 on MX Series; 17.2X75 prior to 17.2X75-D50 on MX Series; 17.3 prior to 17.3R1-S1, 17.3R2 on MX Series. No other Juniper Networks products or platforms are affected by this issue.
problem types: Denial of service
affected:
{
platforms: MX Series
product: Junos OS
vendor: Juniper Networks
versions:
status: affected, version: 14.1 prior to 14.1R8-S5, 14.1R9
status: affected, version: 14.2 prior to 14.2R7-S9, 14.2R8
status: affected, version: 15.1 prior to 15.1F5-S8, 15.1F6-S8, 15.1R5-S3, 15.1R6
status: affected, version: 16.1 prior to 16.1R4-S5, 16.1R5, 16.1R6
status: affected, version: 16.2 prior to 16.2R2-S1, 16.2R3
status: affected, version: 17.1 prior to 17.1R2-S2, 17.1R3
status: affected, version: 17.2 prior to 17.2R1-S3, 17.2R2
status: affected, version: 17.2X75 prior to 17.2X75-D50
status: affected, version: 17.3 prior to 17.3R1-S1, 17.3R2
}
{
platforms: EX2200, EX3300, XRE200
product: Junos OS
vendor: Juniper Networks
versions:
status: affected, version: 14.1X53 prior to 14.1X53-D46, 14.1X53-D50
status: affected, version: 16.1X65 prior to 16.1X65-D45
}
metrics:
cvssV3_0: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 6.5
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
version: 3.0
]
workarounds: Disable chassis extended-statistics.
Use access lists or firewall filters to limit access to the router via SNMP or CLI only from trusted hosts and administrators.