title: Junos OS : Stack overflow vulnerability in CLI command processing
description:
A Stack-based Buffer Overflow vulnerability in the CLI command of Juniper Networks Junos OS allows a low privileged attacker to execute a specific CLI commands leading to Denial of Service.
Repeated actions by the attacker will create a sustained Denial of Service (DoS) condition.
This issue affects Juniper Networks:
Junos OS:
*  All versions prior to 20.4R3-S8;
*  21.2 versions prior to 21.2R3-S6;
*  21.3 versions prior to 21.3R3-S5;
*  22.1 versions prior to 22.1R3-S3;
*  22.3 versions prior to 22.3R3;
*  22.4 versions prior to 22.4R3.
problem types: CWE-787 Out-of-bounds Write
affected:
{
defaultStatus: unaffected
product: Junos OS
vendor: Juniper Networks
versions:
lessThan: 20.4R3-S8, status: affected, version: 0, versionType: semver
lessThan: 21.2R3-S6, status: affected, version: 21.2, versionType: semver
lessThan: 21.3R3-S5, status: affected, version: 21.3, versionType: semver
lessThan: 22.1R3-S3, status: affected, version: 22.1, versionType: semver
lessThan: 22.3R3, status: affected, version: 22.3, versionType: semver
lessThan: 22.4R3, status: affected, version: 22.4, versionType: semver
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: LOCAL
availabilityImpact: HIGH
baseScore: 5.5
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
version: 3.1
]
format: CVSS
scenarios: GENERAL
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: 20.4R3-S8, 21.2R3-S6, 21.3R3-S5, 22.1R3-S3, 22.3R3, 22.4R3, 23.2R1, and all subsequent releases.
workarounds: To reduce the risk of malicious exploitation use access lists or firewall filters to limit access to the CLI only from trusted hosts and administrators.