#VU57438 Protection Mechanism Failure in Juniper Junos OS and Junos OS Evolved - CVE-2021-31362

Vulnerability identifier: #VU57438

Vulnerability risk: Low

CVSSv4.0: 4.6 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-31362

CWE-ID: CWE-693

Exploitation vector: Local 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 bypass implemented security restrictions.

The vulnerability exists due to insufficient implementation of security measures in RPD (routing protocol daemon). A remote attacker on the local network can bypass implemented security restrictions and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 18.2R1-S3 - 18.2R3, 18.3R1-S1 - 18.3R3, 18.4R1-S1 - 18.4R3, 19.1R - 19.1R3, 19.2R1-S1 - 19.2R3, 19.3R1-S1 - 19.3R3, 19.4R1-S1 - 19.4R3, 20.1R1-S1 - 20.1R2, 20.2R1-S1 - 20.2R2, 20.3R1-S1 - 20.3R2, 20.4R1-S1 - 20.4R1

Junos OS Evolved: 21.1

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External links
https://kb.juniper.net/InfoCenter/index?page=content&id=JSA11224&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 authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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