title: Junos OS: Kernel crash upon receipt of crafted CLNP datagrams
description: Receipt of a specially crafted Connectionless Network Protocol (CLNP) datagram destined to an interface of a Junos OS device may result in a kernel crash or lead to remote code execution. Devices are only vulnerable to the specially crafted CLNP datagram if 'clns-routing' or ES-IS is explicitly configured. Devices with without CLNS enabled are not vulnerable to this issue. Devices with IS-IS configured on the interface are not vulnerable to this issue unless CLNS routing is also enabled. This issue only affects devices running Junos OS 15.1. Affected releases are Juniper Networks Junos OS: 15.1 versions prior to 15.1F5-S3, 15.1F6-S8, 15.1F7, 15.1R5; 15.1X49 versions prior to 15.1X49-D60; 15.1X53 versions prior to 15.1X53-D66, 15.1X53-D233, 15.1X53-D471. Earlier releases are unaffected by this vulnerability, and the issue has been resolved in Junos OS 16.1R1 and all subsequent releases.
problem types: Denial of Service
affected:
{
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 15.1F5-S3, 15.1F6-S8, 15.1F7, 15.1R5, status: affected, version: 15.1, versionType: custom
lessThan: 15.1X49-D60, status: affected, version: 15.1X49, versionType: custom
lessThan: 15.1X53-D66, 15.1X53-D233, 15.1X53-D471, status: affected, version: 15.1X53, versionType: custom
}
metrics:
cvssV3_0: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 9.8
baseSeverity: CRITICAL
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
version: 3.0
]
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: 15.1F5-S3, 15.1F6-S8, 15.1F7, 15.1R5, 15.1X49-D60, 15.1X53-D66, 15.1X53-D233, 15.1X53-D471, 16.1R1, and all subsequent releases.
workarounds: Use access lists or firewall filters to limit access to the device via CLNP only from trusted hosts.