title: Junos OS Evolved: BGP and LDP sessions with TCP MD5 authentication established with peers not configured for authentication
description: A vulnerability in the processing of TCP MD5 authentication in Juniper Networks Junos OS Evolved may allow a BGP or LDP session configured with MD5 authentication to succeed, even if the peer does not have TCP MD5 authentication enabled. This could lead to untrusted or unauthorized sessions being established, resulting in an impact on confidentiality or stability of the network. This issue affects Juniper Networks Junos OS Evolved: All versions prior to 20.3R2-S1-EVO; 20.4 versions prior to 20.4R2-EVO; 21.1 versions prior to 21.1R2-EVO. Juniper Networks Junos OS is not affected by this issue.
problem types: CWE-755 Improper Handling of Exceptional Conditions
affected:
{
product: Junos OS Evolved
vendor: Juniper Networks
versions:
lessThan: 20.3R2-S1-EVO, status: affected, version: unspecified, versionType: custom
lessThan: 20.4R2-EVO, status: affected, version: 20.4, versionType: custom
lessThan: 21.1R2-EVO, status: affected, version: 21.1, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 6.5
baseSeverity: MEDIUM
confidentialityImpact: LOW
integrityImpact: LOW
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
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 Evolved 20.3R2-S1-EVO, 20.4R2-EVO, 21.1R2-EVO, 21.2R1-EVO, and all subsequent releases.
workarounds: There are no known workarounds for this issue.