Vulnerability identifier: #VU75097

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-28984

CWE-ID: CWE-416

Exploitation vector: Local 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 perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error in the Layer 2 Address Learning Manager (l2alm) of Juniper Networks Junos OS on QFX Series. A remote attacker on the local network can send specially crafted traffic to the device and crash the Packet Forwarding Engine.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 20.2 - 20.2R3-S6, 21.1 - 21.1R3-S3, 19.4 - 19.4R3-S9, 19.4R1 - 19.4R1-S4, 20.4 - 20.4R3-S4, 22.2R1 - 22.2R1-S2, 22.1R1 - 22.1R2-S2, 21.2R1 - 21.2R3-S2, 21.4R1 - 21.4R2-S2

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External links
http://supportportal.juniper.net/s/article/2023-04-Security-Bulletin-Junos-OS-QFX-Series-The-PFE-may-crash-when-a-lot-of-MAC-addresses-are-being-learned-and-aged-CVE-2023-28984

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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 local network (LAN).

Is there known malware, which exploits this vulnerability?

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