Vulnerability identifier: #VU88488

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-30410

CWE-ID: CWE-696

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Juniper Junos OS
Operating systems & Components / Operating system

Vendor: Juniper Networks, Inc.

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to an incorrect behavior order error in the routing engine (RE) of Juniper Networks Junos OS on EX4300 Series, which allows traffic intended to the device to reach the RE instead. A remote attacker can send specially crafted IPv6 packets to the device and bypass implemented firewall rules.

Note, the vulnerability affects only EX4300 switch.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 21.4R1 - 21.4R3-S5, 20.4R1 - 20.4R3-S9, 21.2R1 - 21.2R3-S6

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External links
http://supportportal.juniper.net/s/article/2024-04-Security-Bulletin-Junos-OS-EX4300-Series-Loopback-filter-not-blocking-traffic-despite-having-discard-term-CVE-2024-30410

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.