Vulnerability identifier: #VU57436

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-2021-31353

CWE-ID: CWE-703

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Juniper Junos OS
Operating systems & Components / Operating system
Junos OS Evolved
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 improper check or handling of exceptional conditions. A remote attacker can inject a specific BGP update and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 19.4R3-S3, 19.3R3-S2, 20.2R2-S3 - 20.2R3-S1, 20.3R2 - 20.3R2-S1, 20.4R2 - 20.4R2-S2, 21.1R1 - 21.1R1-S1

Junos OS Evolved: 21.1-EVO, 21.2-EVO

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External links
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11218&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.