CVE-2020-1633 Information

Description

Due to a new NDP proxy feature for EVPN leaf nodes introduced in Junos OS 17.4 crafted NDPv6 packets could transit a Junos device configured as a Broadband Network Gateway (BNG) and reach the EVPN leaf node causing a stale MAC address entry. This could cause legitimate traffic to be discarded leading to a Denial of Service (DoS) condition. This issue only affects Junos OS 17.4 and later releases. Prior releases do not support this feature and are unaffected by this vulnerability. This issue only affects IPv6. IPv4 ARP proxy is unaffected by this vulnerability. This issue affects Juniper Networks Junos OS: 17.4 versions prior to 17.4R2-S9 17.4R3 on MX Series; 18.1 versions prior to 18.1R3-S9 on MX Series; 18.2 versions prior to 18.2R2-S7 18.2R3-S3 on MX Series; 18.2X75 versions prior to 18.2X75-D33 18.2X75-D411 18.2X75-D420 18.2X75-D60 on MX Series; 18.3 versions prior to 18.3R1-S7 18.3R2-S3 18.3R3 on MX Series; 18.4 versions prior to 18.4R1-S5 18.4R2-S2 18.4R3 on MX Series; 19.1 versions prior to 19.1R1-S4 19.1R2 on MX Series; 19.2 versions prior to 19.2R1-S3 19.2R2 on MX Series.

CVSS Vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://kb.juniper.net/JSA11012

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

6.5