#VU54623 Out-of-bounds read in SonicWall Switch - CVE-2021-20024

Vulnerability identifier: #VU54623

Vulnerability risk: Medium

CVSSv4.0: 5 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-20024

CWE-ID: CWE-125

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
SonicWall Switch
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: SonicWall

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information or perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition when handling LLDP Protocol. A remote attacker on the local network can send specially crafted traffic to the device, trigger an out-of-bounds read error and read contents of memory on the system.

Mitigation

Install updates from vendor's website.

The following models are affected:

SWS14-48FPOE, SWS14-48, SWS14-24FPOE, SWS14-24, SWS12-10FPOE, SWS12-8POE, SWS12-8

Vulnerable software versions

SonicWall Switch: before 1.1.0.0-11s

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External links
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0011

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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.