Vulnerability identifier: #VU75151

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-2023-28961

CWE-ID: CWE-241

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 send unwanted traffic to the device.

The vulnerability exists due to improper handling of unexpected data type in IPv6 firewall filter processing, which prevents a firewall filter with the term 'from next-header ah' from being properly installed in the packet forwarding engine (PFE).

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 20.2 - 20.2R3-S6, 21.2R1 - 21.2R3-S3, 21.4R1 - 21.4R2-S2, 21.1 - 21.1R3-S2, 22.1R1 - 22.1R1-S2, 20.4 - 20.4R3-S3, 21.3R1 - 21.3R2-S2

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External links
http://supportportal.juniper.net/s/article/2023-04-Security-Bulletin-Junos-OS-ACX-Series-IPv6-firewall-filter-is-not-installed-in-PFE-when-from-next-header-ah-is-used-CVE-2023-28961

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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.