CVE-2018-0056 json
MX Series: L2ALD daemon may crash if a duplicate MAC is learned by two different interfaces
published 2018-10-10 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-0880
- cvss
- 6.5
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 49%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Juniper Networks Junos OS 15.1R7-S1, 16.1R4-S12, 16.1R6-S6, 16.2R2-S7, 17.1R2-S9, 17.2R1-S7, 17.2R2-S6, 17.3R2-S4, 17.3R3-S1, 17.4R1-S5, 18.1R2
Exploit prediction
0.61% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 6.5 | CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 3.0 | 5.3 | CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 2.9 | AV:A/AC:M/Au:N/C:N/I:N/A:P |
Affected products
- Juniper Networks Junos OS
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
kb.juniper.net
/JSA10890
vendor-advisory
-
securitytracker.com
/id/1041857
vdb-entry, third-party-advisory
Sources
- CVE List CVE-2018-0056
- NVD CVE-2018-0056
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.