PT-2021-20803 · Zyxel · Zyxel Gs1900-8

Published 2021-07-26 · Updated 2021-08-13 · CVE-2021-35030

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: Zyxel GS1900-8 firmware version V2.60

Description: A vulnerability was found in the CGI program that did not properly sterilize packet contents, allowing an authenticated, local user to perform a cross-site scripting (XSS) attack via a crafted LLDP packet.

Recommendations: For Zyxel GS1900-8 firmware version V2.60, consider updating to a newer version that addresses this issue, as no specific fix is provided for this version. As a temporary workaround, consider restricting access to the CGI program to minimize the risk of exploitation.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2021-35030

Affected Products

Zyxel Gs1900-8

References · 6

• https://zyxel.com/support/Zyxel_security_advisory_for_XSS_vulnerability_of_GS1900_series_switches.shtml · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-35030 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-35030 · Security Note
• https://t.me/cibsecurity/26479 · Telegram Post
• https://t.me/cvenotify/18108 · Telegram Post
• https://t.me/cvenotify/19288 · Telegram Post