Vulnerability identifier: #VU76985

Vulnerability risk: Medium

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

CVE-ID: CVE-2023-27989

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
LTE7480-M804
Hardware solutions / Firmware
LTE7490-M904
Hardware solutions / Firmware
NR7101
Hardware solutions / Firmware
Nebula NR7101
Hardware solutions / Firmware

Vendor: ZyXEL Communications Corp.

Description

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

The vulnerability exists due to a boundary error in the CGI program. A remote user can send a specially crafted HTTP request, trigger memory corruption and cause a denial of service condition on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

LTE7480-M804: 1.00(ABRA.6)C0

LTE7490-M904: All versions

NR7101: 1.00(ABUV.7)C0

Nebula NR7101: 1.15(ACCC.3)C0

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External links
http://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-privilege-escalation-vulnerability-in-gs1900-series-switches

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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 Internet.

Is there known malware, which exploits this vulnerability?

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