Denial of service in Junos OS flowd

Published: 2022-01-12
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2022-22175
Exploitation vector Network
Public exploit N/A
Vulnerable software
Juniper Junos OS
Operating systems & Components / Operating system


Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper locking

EUVDB-ID: #VU59562

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-2022-22175

CWE-ID: CWE-667 - Improper Locking

Exploit availability: No


The vulnerability allows a remote attacker to perform a denial of service attack (DoS).

The vulnerability exists due to improper locking in the SIP ALG of Juniper Networks Junos OS on MX Series and SRX Series. An non-authenticated attacker can send specially crafted traffic to the system to cause a flowprocessing daemon (flowd) crash.


Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: before 21.3R2, 21.3R1-S1, 21.1R2-S2, 20.4R3-S1, 21.4R1, 21.2R1-S2, 21.1R3, 21.2R2

CPE2.3 External links

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.