CVE-2018-0063

Junos OS: Nexthop index allocation failed: private index space exhausted after incoming ARP requests to management interface

Description

A vulnerability in the IP next-hop index database in Junos OS 17.3R3 may allow a flood of ARP requests, sent to the management interface, to exhaust the private Internal routing interfaces (IRIs) next-hop limit. Once the IRI next-hop database is full, no further next hops can be learned and existing entries cannot be cleared, leading to a sustained denial of service (DoS) condition. An indicator of compromise for this issue is the report of the following error message: %KERN-4: Nexthop index allocation failed: private index space exhausted This issue only affects the management interface, and does not impact regular transit traffic through the FPCs. This issue also only affects Junos OS 17.3R3. No prior versions of Junos OS are affected by this issue. Affected releases are Juniper Networks Junos OS: 17.3R3.

Remediation

Solution:

  • The following software releases have been updated to recover from private index space exhaustion: 17.3R3-S1 and all subsequent releases.

Workaround:

  • There are no viable workarounds for this issue.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.12%
Vendor Advisory juniper.net
Affected: Juniper Networks Junos OS
Published at:
Updated at:

References

Link Tags
http://www.securitytracker.com/id/1041861 vdb entry third party advisory
https://kb.juniper.net/JSA10899 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2018-0063?
CVE-2018-0063 has been scored as a medium severity vulnerability.
How to fix CVE-2018-0063?
To fix CVE-2018-0063: The following software releases have been updated to recover from private index space exhaustion: 17.3R3-S1 and all subsequent releases.
Is CVE-2018-0063 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2018-0063 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2018-0063?
CVE-2018-0063 affects Juniper Networks Junos OS.
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