Vulnerability identifier: #VU82466

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-2022-22191

CWE-ID: CWE-400

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 non-authenticated attacker to perform a denial of service (DoS) attack.

A Denial of Service (DoS) vulnerability in the processing of a flood of specific ARP traffic in Juniper Networks Junos OS on the EX4300 switch, sent from the local broadcast domain, may allow an unauthenticated network-adjacent attacker to trigger a PFEMAN watchdog timeout, causing the Packet Forwarding Engine (PFE) to crash and restart.

After the restart, transit traffic will be temporarily interrupted until the PFE is reprogrammed.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 19.2 - 19.2R1-S8, 19.2R1-S4, 15.1 - 15.1R7-S11, 15.1F - 15.1F7-S2, 21.3R1 - 21.3R1-S1, 21.2R1 - 21.2R2, 19.4 - 19.4R2-S5, 19.4R1 - 19.4R1-S4, 18.4 - 18.4R2-S9, 18.4R1-S5, 18.4R2-S3, 19.1 - 19.1R3-S7, 19.1R1-S4, 20.3 - 20.3R3-S1, 20.1 - 20.1R3-S2, 19.3 - 19.3R3-S4, 19.3R1-S1, 19.3R2 - 19.3R2-S7, 20.4 - 20.4R3, 21.1 - 21.1R2-S2, 20.2 - 20.2R3-S2

---

External links
http://supportportal.juniper.net/s/article/2022-04-Security-Bulletin-Junos-OS-EX4300-PFE-Denial-of-Service-DoS-upon-receipt-of-a-flood-of-specific-ARP-traffic-CVE-2022-22191

---

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.