CVE-2021-35030
MEDIUM
4.3
CVSS Score
Published: July 26, 2021 at 11:20 AM UTC
Updated: June 17, 2026 at 03:56 AM UTC
24 products affected across 1 vendorGS1900-10HP firmwareGS1900-24 firmwareGS1900-8 Firmware
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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.3%
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
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 2.70
Affected range stops below 2.70, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-10hp (same device)
v < 2.70
Affected range stops below 2.70, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-16 (same device)
v < 2.70
Affected range stops below 2.70, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-24 (same device)
v < 2.70
Affected range stops below 2.70, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-24e (same device)
v < 2.70
Affected range stops below 2.70, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-24ep (same device)
v < 2.70
Affected range stops below 2.70, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-24hp (same device)
v < 2.70
Affected range stops below 2.70, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-24hpv2 (same device)
v < 2.70
Affected range stops below 2.70, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-48 (same device)
v < 2.70
Affected range stops below 2.70, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-48hp (same device)
v < 2.70
Affected range stops below 2.70, so it looks safe — our inference, not a vendor statement
zyxel-gs1900-48hpv2 (same device)
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
x_refsource_MISCPatchVendor Advisory
Source: [email protected]
https://www.zyxel.com/support/Zyxel_security_advisory_for_XSS_vulnerability_of_GS1900_series_switches.shtmlCVSS
- Attack Vector
- ADJACENT_NETWORK
- Complexity
- LOW
- Privileges
- HIGH
- User Interaction
- REQUIRED
- Scope
- CHANGED
- Confidentiality
- LOW
- Integrity
- LOW
- Availability
- NONE
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-79
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