title: Junos OS: MX Series: Receipt of specific packet on MS-MPC/MS-MIC causes line card reset
description: An Improper Check for Unusual or Exceptional Conditions in packet processing on the MS-MPC/MS-MIC utilized by Juniper Networks Junos OS allows a malicious attacker to send a specific packet, triggering the MS-MPC/MS-MIC to reset, causing a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue only affects specific versions of Juniper Networks Junos OS on MX Series: 17.3R3-S11; 17.4R2-S13; 17.4R3 prior to 17.4R3-S5; 18.1R3-S12; 18.2R2-S8, 18.2R3-S7, 18.2R3-S8; 18.3R3-S4; 18.4R3-S7; 19.1R3-S4, 19.1R3-S5; 19.2R1-S6; 19.3R3-S2; 19.4R2-S4, 19.4R2-S5; 19.4R3-S2; 20.1R2-S1; 20.2R2-S2, 20.2R2-S3, 20.2R3; 20.3R2, 20.3R2-S1; 20.4R1, 20.4R1-S1, 20.4R2; 21.1R1; This issue does not affect any version of Juniper Networks Junos OS prior to 15.1X49-D240;
problem types: CWE-754 Improper Check for Unusual or Exceptional Conditions
affected:
{
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 15.1, status: unaffected, version: unspecified, versionType: custom
lessThan: 17.3R3-S11, status: unaffected, version: 17.3, versionType: custom
lessThan: 17.4*, status: unaffected, version: 17.4R3, versionType: custom
}
{
platforms: MX Series
product: Junos OS
vendor: Juniper Networks
versions:
status: affected, version: 17.3R3-S11
status: affected, version: 18.1R3-S12
status: affected, version: 18.3R3-S4
status: affected, version: 18.4R3-S7
status: affected, version: 19.1R3-S4, 19.1R3-S5
status: affected, version: 19.2R1-S6
status: affected, version: 19.3R3-S2
status: affected, version: 19.4R3-S2
status: affected, version: 20.1R2-S1
status: affected, version: 20.2R3
status: affected, version: 20.3R2
lessThan: 17.4*, status: affected, version: 17.4R2-S13, versionType: custom
lessThan: 18.2*, status: affected, version: 18.2R2-S8, 18.2R3-S7, versionType: custom
lessThan: 18.4*, status: affected, version: 18.4R1-S8, 18.4R2-S7, versionType: custom
lessThan: 19.4*, status: affected, version: 19.4R2-S4, versionType: custom
lessThan: 20.2*, status: affected, version: 20.2R2-S2, versionType: custom
lessThan: 20.3*, status: affected, version: 20.3R1-S2, versionType: custom
lessThan: 20.4R2-S1, 20.4R3, status: affected, version: 20.4, versionType: custom
lessThan: 21.1R1-S1, 21.1R2, status: affected, version: 21.1, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 7.5
baseSeverity: HIGH
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
version: 3.1
]
exploits: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
solutions: The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S12, 17.4R3-S5, 18.1R3-S13, 18.3R3-S5, 18.4R3-S8, 19.1R3-S6, 19.2R1-S7, 19.2R3-S2, 19.3R2-S6, 19.3R3-S3, 19.4R3-S3, 20.1R2-S2, 20.1R3, 20.2R3-S1, 20.3R3, 20.4R2-S1, 20.4R3, 21.1R1-S1, 21.1R2, 21.2R1, and all subsequent releases.
Note: Only those releases listed in the PROBLEM section above are affected.  This fix has also been proactively committed into other releases that are not vulnerable to this issue.
workarounds: There are no viable workarounds for this issue.