Vulnerability identifier: #VU78283

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-2023-36848

CWE-ID: CWE-20

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 insufficient validation of user-supplied input in the periodic packet management daemon (PPMD) of Juniper Networks Junos OS on MX Series(except MPC10, MPC11 and LC9600). A remote attacker on the local network can send a malformed CFM packet to the affected device and crash the FPC.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 21.4R1 - 21.4R3-S3, 20.2 - 20.2R3-S7, 22.3R1 - 22.3R2-S2, 22.2R1 - 22.2R3, 22.1R1 - 22.1R3-S2, 21.2R1 - 21.2R3-S4, 22.4R1 - 22.4R1-S1, 20.4 - 20.4R3-S6, 19.4 - 19.4R3-S11, 19.4R1 - 19.4R1-S4, 19.3 - 19.3R3-S7, 19.3R1-S1, 19.3R2 - 19.3R2-S7, 19.2 - 19.2R3-S6, 19.2R1-S4, 19.1 - 19.1R3-S9, 19.1R1-S4, 21.1 - 21.1R3-S4, 21.3R1 - 21.3R3-S3

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External links
http://supportportal.juniper.net/s/article/2023-07-Security-Bulletin-Junos-OS-The-FPC-will-crash-on-receiving-a-malformed-CFM-packet-CVE-2023-36848

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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.