Low severity3.5NVD Advisory· Published Jul 26, 2021· Updated Jun 17, 2026

CVE-2021-35030

Description

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.

Affected products

Zyxel/Gs1900 10hp Firmware2 versions
cpe:2.3:o:zyxel:gs1900-10hp_firmware:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:zyxel:gs1900-10hp_firmware:*:*:*:*:*:*:*:*range: <2.70
- (no CPE)range: 2.60
Zyxel/Gs1900 16 Firmware
cpe:2.3:o:zyxel:gs1900-16_firmware:*:*:*:*:*:*:*:*
Range: <2.70
Zyxel/Gs1900 24 Firmware
cpe:2.3:o:zyxel:gs1900-24_firmware:*:*:*:*:*:*:*:*
Range: <2.70
Zyxel/Gs1900 24e Firmware
cpe:2.3:o:zyxel:gs1900-24e_firmware:*:*:*:*:*:*:*:*
Range: <2.70
Zyxel/Gs1900 24ep Firmware
cpe:2.3:o:zyxel:gs1900-24ep_firmware:*:*:*:*:*:*:*:*
Range: <2.70
Zyxel/Gs1900 24hp Firmware
cpe:2.3:o:zyxel:gs1900-24hp_firmware:*:*:*:*:*:*:*:*
Range: <2.70
Zyxel/Gs1900 24hpv2 Firmware
cpe:2.3:o:zyxel:gs1900-24hpv2_firmware:*:*:*:*:*:*:*:*
Range: <2.70
Zyxel/Gs1900 48 Firmware
cpe:2.3:o:zyxel:gs1900-48_firmware:*:*:*:*:*:*:*:*
Range: <2.70
Zyxel/Gs1900 48hp Firmware
cpe:2.3:o:zyxel:gs1900-48hp_firmware:*:*:*:*:*:*:*:*
Range: <2.70
Zyxel/Gs1900 48hpv2 Firmware
cpe:2.3:o:zyxel:gs1900-48hpv2_firmware:*:*:*:*:*:*:*:*
Range: <2.70
Zyxel/Gs1900 8 Firmware
cpe:2.3:o:zyxel:gs1900-8_firmware:*:*:*:*:*:*:*:*
Range: <2.70
Zyxel/Gs1900 8hp Firmware
cpe:2.3:o:zyxel:gs1900-8hp_firmware:*:*:*:*:*:*:*:*
Range: <2.70
Zyxel/GS1900 seriesllm-fuzzy
Range: = V2.60
Zyxel/GS1900-8llm-fuzzy
Range: = V2.60

Patches

Vulnerability mechanics

References

www.zyxel.com/support/Zyxel_security_advisory_for_XSS_vulnerability_of_GS1900_series_switches.shtmlnvdPatchVendor Advisory

News mentions

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cvss	0.227
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000