Home/CVE/A vulnerability was found in the CGI program in Zyxel GS1900-8 firmware version V2.60, that did not properly sterilize p
CVE

CVE-2021-35030

A vulnerability was found in the CGI program in Zyxel GS1900-8 firmware version V2.60, that did not properly sterilize p

A vulnerability was found in the CGI program in Zyxel GS1900-8 firmware version V2.60, that did not properly sterilize packet contents and could allow an authenticated, local user to perform a cross-site scripting (XSS) attack via a crafted LLDP packet.

LOW · CVSS 3.5 EPSS 0.00115
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
▤

Affected Products & Versions

12
zyxel gs1900-8 firmware< 2.70
zyxel gs1900-8hp firmware< 2.70
zyxel gs1900-10hp firmware< 2.70
zyxel gs1900-16 firmware< 2.70
zyxel gs1900-24e firmware< 2.70
zyxel gs1900-24ep firmware< 2.70
zyxel gs1900-24 firmware< 2.70
zyxel gs1900-24hp firmware< 2.70
▣

Scoring & Timeline

3.5
LOW · CVSS v3.1 · security@zyxel.com.tw
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD26 Jul 2021 · 12:15 PM
CVSS VectorCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.zyxel.com/support/Zyxel_security_advisory_for_XSS_vulnerability_of_GS1900_series_switches.shtmlPatchVendor Advisory
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