CVE-2018-0056
MX Series: L2ALD daemon may crash if a duplicate MAC is learned by two different interfaces
- Published
- Updated
- Reserved
- Assigned by
- juniper
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| juniperCNA (assigner) | 3.0 | Medium6.5 | CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.0 | Medium5.3 | CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.61% · top 51% of all CVEs (4 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.
Weakness
- Denial of service
- CWE-20 (opens in a new tab)All about CWE-20 and its CVEs
Affected products
- affected 15.1 – < 15.1R7-S1
- affected 16.1 – < 16.1R4-S12, 16.1R6-S6
- affected 16.2 – < 16.2R2-S7
- affected 17.1 – < 17.1R2-S9
- affected 17.2 – < 17.2R1-S7, 17.2R2-S6
- affected 17.3 – < 17.3R2-S4, 17.3R3-S1
- affected 17.4 – < 17.4R1-S5
- affected 18.1 – < 18.1R2
What to do
Solution: The following software releases have been updated to resolve this specific issue: 15.1R7-S1, 16.1R4-S12, 16.1R6-S6, 16.1R7, 16.2R2-S7, 16.2R3, 17.1R2-S9, 17.1R3, 17.2R1-S7, 17.2R2-S6, 17.2R3, 17.3R2-S4, 17.3R3-S1, 17.4R1-S5, 17.4R2, 18.1R2, 18.2R1, and all subsequent releases. This fix has also been proactively committed into Junos OS: 15.1X49-D150, 15.1X53-D235, 15.1X53-D495, 15.1X53-D590, 15.1X53-D68, 18.2X75-D5, and all subsequent releases.
Workaround: There are no viable workarounds for this issue
Exploitation: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
References (2)
- https://kb.juniper.net/JSA10890 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 1041857 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2018-0056)Record last updated .