PT-2021-4810 · Zyxel · Zyxel Vpn2S

Published 2021-09-29 · Updated 2021-10-02 · CVE-2021-35028

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Zyxel VPN2S firmware version 1.12

Description A command injection vulnerability in the CGI program could allow an authenticated, local user to execute arbitrary OS commands. The vulnerability is related to the failure to neutralize special elements used in the operating system command.

Recommendations For Zyxel VPN2S firmware version 1.12, consider disabling the CGI program as a temporary workaround until a patch is available. Restrict access to the CGI interface to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

OS Command Injection

Weakness Enumeration

CWE-78

Related Identifiers

BDU:2021-05537

CVE-2021-35028

Affected Products

Zyxel Vpn2S

References · 6

• https://osv.dev/vulnerability/CVE-2021-35028 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-35028 · Security Note
• https://zyxel.com/support/Zyxel_security_advisory_for_directory_traversal_and_command_injection_vulnerabilities_of_VPN2S_Firewall.shtml · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-05537 · Security Note
• https://t.me/cvenotify/21618 · Telegram Post
• https://t.me/cibsecurity/29622 · Telegram Post