CVE-2024-30410

Junos OS: EX4300 Series: Loopback filter not blocking traffic despite having discard term.

Description

An Incorrect Behavior Order in the routing engine (RE) of Juniper Networks Junos OS on EX4300 Series allows traffic intended to the device to reach the RE instead of being discarded when the discard term is set in loopback (lo0) interface. The intended function is that the lo0 firewall filter takes precedence over the revenue interface firewall filter.  This issue affects only IPv6 firewall filter. This issue only affects the EX4300 switch. No other products or platforms are affected by this vulnerability.  This issue affects Juniper Networks Junos OS: * All versions before 20.4R3-S10, * from 21.2 before 21.2R3-S7, * from 21.4 before 21.4R3-S6.

Remediation

Solution:

  • The following software releases have been updated to resolve this specific issue:  Junos OS: 20.4R3-S10, 21.2R3-S7, 21.4R3-S6, and all subsequent releases.

Workaround:

  • When lo0 filter is applied before the revenue interface (ex. ge-0/0/0) filter this issue could be avoided.

Category

6.9
CVSS
Severity: Medium
CVSS 4.0 •
CVSS 3.1 •
EPSS 0.14%
Vendor Advisory juniper.net
Affected: Juniper Networks Junos
Published at:
Updated at:

References

Link Tags
https://supportportal.juniper.net/JSA79100 vendor advisory
https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N issue tracking technical description

Frequently Asked Questions

What is the severity of CVE-2024-30410?
CVE-2024-30410 has been scored as a medium severity vulnerability.
How to fix CVE-2024-30410?
To fix CVE-2024-30410: The following software releases have been updated to resolve this specific issue:  Junos OS: 20.4R3-S10, 21.2R3-S7, 21.4R3-S6, and all subsequent releases.
Is CVE-2024-30410 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2024-30410 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-2024-30410?
CVE-2024-30410 affects Juniper Networks Junos.
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