Vulnerability identifier: #VU57360

Vulnerability risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-31364

CWE-ID: CWE-754

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Juniper Junos OS
Operating systems & Components / Operating system
SRX300
Hardware solutions / Routers & switches, VoIP, GSM, etc
SRX500
Hardware solutions / Routers & switches, VoIP, GSM, etc
SRX1500
Hardware solutions / Routers & switches, VoIP, GSM, etc
SRX5000
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Juniper Networks, Inc.

Description

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

The vulnerability exists due to improper check for unusual or exceptional conditions in the flow daemon (flowd). A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 17.4R1 - 17.4R3-S4, 17.4R2-S9, 18.3R1 - 18.3R3-S4, 18.3R3-S1, 18.3R2-S3, 18.4R1 - 18.4R3-S8, 18.4R2-S3, 18.4R1-S5, 19.1R - 19.1R3-S5, 19.1R1-S4, 19.2R1 - 19.2R3-S1, 19.2R1-S4, 19.3R1 - 19.3R3-S1, 19.3R2 - 19.3R2-S5, 19.3R1-S1, 19.4R2 - 19.4R3-S5, 19.4R1 - 19.4R1-S3, 20.1R1 - 20.1R2-S1, 20.2R1 - 20.2R2-S3, 20.3R1 - 20.3R2, 20.4R1 - 20.4R1-S1

SRX300: All versions

SRX500: All versions

SRX1500: All versions

SRX5000: All versions

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External links
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11226&cat=SIRT_1&actp=LIST

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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.