Vulnerability identifier: #VU49576

Vulnerability risk: Medium

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-0203

CWE-ID: CWE-399

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

The vulnerability exists due to improper management of internal resources on Juniper Networks EX and QFX5K Series platforms configured with Redundant Trunk Group (RTG). The Storm Control profile applied on the RTG interface might not take affect when it reaches the threshold condition. A remote attacker can perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

This issue affects Juniper Networks Junos OS on EX Series and QFX5K Series:

15.1 versions prior to 15.1R7-S7;

16.1 versions prior to 16.1R7-S8;

17.2 versions prior to 17.2R3-S4;

17.3 versions prior to 17.3R3-S8;

17.4 versions prior to 17.4R2-S11, 17.4R3-S2;

18.1 versions prior to 18.1R3-S10;

18.2 versions prior to 18.2R3-S5;

18.3 versions prior to 18.3R2-S4, 18.3R3-S2;

18.4 versions prior to 18.4R2-S5, 18.4R3-S3;

19.1 versions prior to 19.1R2-S2, 19.1R3-S2;

19.2 versions prior to 19.2R1-S5, 19.2R2-S1, 19.2R3;

19.3 versions prior to 19.3R2-S4, 19.3R3;

19.4 versions prior to 19.4R1-S3, 19.4R2-S1, 19.4R3;

20.1 versions prior to 20.1R1-S2, 20.1R2.

Vulnerable software versions

Juniper Junos OS: 19.2 - 19.2R2, 19.2R1-S4, 20.1 - 20.1R1-S4, 19.4 - 19.4R2-S8, 19.4R1 - 19.4R1-S4, 19.3 - 19.3R1, 19.3R1-S1, 19.3R2 - 19.3R2-S7, 20.2, 19.1 - 19.1R3-S1, 19.1R1-S4, 18.4 - 18.4R3-S2, 18.4R1-S5, 18.4R2-S3, 18.2 - 18.2R3-S4, 18.3 - 18.3R3, 18.3R2-S3, 18.3R3-S1, 18.1 - 18.1R3-S9, 17.4 - 17.4R3-S1, 17.4R2-S9, 17.3 - 17.3R3-S7, 17.2 - 17.2R3-S3, 16.1 - 16.1R7-S6, 16.1R7-S7, 15.1 - 15.1R7-S6, 15.1F - 15.1F7-S2

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External links
http://kb.juniper.net/JSA11093

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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.