#VU47687 Heap-based buffer overflow in SonicOS - CVE-2020-5138

Vulnerability identifier: #VU47687

Vulnerability risk: High

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-5138

CWE-ID: CWE-122

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SonicOS
Operating systems & Components / Operating system

Vendor: SonicWall

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error within the SSLVPN service. A remote non-authenticated attacker can send specially crafted request to the device and crash it.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SonicOS: 5.9 - 7.0

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External links
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2020-0013

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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 Internet.

Is there known malware, which exploits this vulnerability?

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