#VU54988 Resource management error in Junos OS Evolved and Juniper Junos OS - CVE-2021-0287

Vulnerability identifier: #VU54988

Vulnerability risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-0287

CWE-ID: CWE-399

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Junos OS Evolved
Operating systems & Components / Operating system
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 within the application. In an Segment Routing ISIS (SR-ISIS)/MPLS environment, on Juniper Networks Junos OS and Junos OS Evolved devices, configured with ISIS Flexible Algorithm for Segment Routing and sensor-based statistics, a flap of a ISIS link in the network, can lead to a routing process daemon (RPD) crash and restart, causing a Denial of Service (DoS). Continued link flaps will create a sustained Denial of Service (DoS) condition.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Junos OS Evolved: 20.3-EVO - 20.3, 20.4R1-EVO - 20.4, 21.1-EVO - 21.1

Juniper Junos OS: 19.4R1-S1 - 19.4, 20.1R1-S1 - 20.1, 20.2R1-S1 - 20.2, 20.3R1-S1 - 20.3, 20.4

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External links
https://kb.juniper.net/JSA11189

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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.