Vulnerability identifier: #VU55001

Vulnerability risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-0277

CWE-ID: CWE-125

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 perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition in the processing of specially crafted LLDP frames by the Layer 2 Control Protocol Daemon (l2cpd). A remote attacker on the local network can trigger out-of-bounds read error and cause a denial of service condition on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Juniper Junos OS: 12.3, 15.1, 18.4, 18.3, 18.2, 18.1, 17.4, 17.3, 20.3, 20.2, 19.4, 19.3, 19.2, 19.1, 20.1, 20.4

Junos OS Evolved: 20.4 - 20.4R1-S2-EVO

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External links
http://kb.juniper.net/JSA11181

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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.