CVE-2018-0056

If a duplicate MAC address is learned by two different interfaces on an MX Series device, the MAC address learning function correctly flaps between the interfaces. However, the Layer 2 Address Learning Daemon (L2ALD) daemon might crash when attempting to delete the duplicate MAC address when the particular entry is not found in the internal MAC address table. This issue only occurs on MX Series devices with l2-backhaul VPN configured. No other products or platforms are affected by this issue. Affected releases are Juniper Networks Junos OS: 15.1 versions prior to 15.1R7-S1 on MX Series; 16.1 versions prior to 16.1R4-S12, 16.1R6-S6 on MX Series; 16.2 versions prior to 16.2R2-S7 on MX Series; 17.1 versions prior to 17.1R2-S9 on MX Series; 17.2 versions prior to 17.2R1-S7, 17.2R2-S6 on MX Series; 17.3 versions prior to 17.3R2-S4, 17.3R3-S1 on MX Series; 17.4 versions prior to 17.4R1-S5 on MX Series; 18.1 versions prior to 18.1R2 on MX Series.

• CWE-20

• http://www.securitytracker.com/id/1041857Third Party Advisory, VDB Entry
• https://kb.juniper.net/JSA10890Vendor Advisory
• http://www.securitytracker.com/id/1041857Third Party Advisory, VDB Entry
• https://kb.juniper.net/JSA10890Vendor Advisory

Published

Oct 10, 2018

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2018-0050An error handling vulnerability in Routing Protocols Daemon …7.5
• CVE-2018-0051A Denial of Service vulnerability in the SIP application lay…7.5
• CVE-2018-0052If RSH service is enabled on Junos OS and if the PAM authent…7.2
• CVE-2018-0053An authentication bypass vulnerability in the initial boot s…6.8
• CVE-2018-0054On QFX5000 Series and EX4600 switches, a high rate of Ethern…6.5
• CVE-2018-0055Receipt of a specially crafted DHCPv6 message destined to a …6.5
• CVE-2018-0057On MX Series and M120/M320 platforms configured in a Broadba…6.1
• CVE-2018-0058Receipt of a specially crafted IPv6 exception packet may be …5.9
• CVE-2018-0059A persistent cross-site scripting vulnerability in the graph…5.4
• CVE-2018-0060An improper input validation weakness in the device control …5.3
• CVE-2018-0061A denial of service vulnerability in the telnetd service on …5.3
• CVE-2018-0062A Denial of Service vulnerability in J-Web service may allow…5.3