Vulnerability identifier: #VU82115

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-36841

CWE-ID: CWE-20

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 unauthenticated network-based attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause an infinite loop, resulting in a Denial of Service (DoS). An attacker who sends malformed TCP traffic via an interface configured with PPPoE, causes an infinite loop on the respective PFE.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 22.3R1 - 22.3R2-S1, 22.1R1 - 22.1R3-S3, 21.2R1 - 21.2R3-S5, 20.4 - 20.4R3-S6, 21.4R1 - 21.4R3-S2, 22.4R1 - 22.4R1-S2, 22.2R1 - 22.2R2-S2

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External links
http://supportportal.juniper.net/s/article/2023-10-Security-Bulletin-Junos-OS-MX-Series-Receipt-of-malformed-TCP-traffic-will-cause-a-Denial-of-Service-CVE-2023-36841

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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.