Vulnerability identifier: #VU49549

Vulnerability risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-0215

CWE-ID: CWE-401

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 attacker to perform DoS attack on the target system.

The vulnerability exists due memory leak in packet forwarding engine due to 802.1X authenticator port interface flaps. A remote attacker can force the application to leak memory and perform denial of service attack.

Mitigation

Install updates from vendor's website.

This issue affects Juniper Networks Junos OS:

14.1X53 versions prior to 14.1X53-D54;

15.1X49 versions prior to 15.1X49-D240 ;

15.1X53 versions prior to 15.1X53-D593;

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 18.2R2-S7, 18.2R3-S3;

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

18.4 versions prior to 18.4R1-S7, 18.4R2-S4, 18.4R3-S2;

19.1 versions prior to 19.1R1-S5, 19.1R2-S2, 19.1R3;

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

19.3 versions prior to 19.3R2-S3, 19.3R3;

19.4 versions prior to 19.4R1-S2, 19.4R2.

This issue does not affect Juniper Networks Junos OS 12.3, 15.1.

Vulnerable software versions

Juniper Junos OS: 14.1 - 14.1x51, 14.1x53 - 14.1X53-D53, 15.1 - 15.1R7-S13, 15.1F - 15.1F7-S2, 15.1X49 - 15.1X49-D230, 15.1X49-D210, 20.1, 15.1X53 - 15.1X53-D592, 19.2 - 19.2R1-S9, 19.2R1-S4, 19.1 - 19.1R2-S3, 19.1R1-S4, 18.4 - 18.4R3-S1, 18.4R1-S5, 18.4R2-S3, 19.4, 19.4R1 - 19.4R1-S4, 19.3 - 19.3R1, 19.3R1-S1, 19.3R2 - 19.3R2-S7, 18.3 - 18.3R3, 18.3R2-S3, 18.3R3-S1, 18.2 - 18.2R3-S2, 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

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External links
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11105&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 local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.