CVE-2021-35030 : A vulnerability was found in the CGI program in Zyxel GS1900-8 firmware version

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.

Published 2021-07-26 12:15:09

Updated 2021-08-13 12:53:43

Source Zyxel Corporation

View at NVD, CVE.org

Vulnerability category: Cross site scripting (XSS)

Products affected by CVE-2021-35030

Zyxel » Gs1900-8 Firmware
Versions before (<) 2.70
cpe:2.3:o:zyxel:gs1900-8_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Gs1900-8 » Version: N/A
Zyxel » Gs1900-24 Firmware
Versions before (<) 2.70
cpe:2.3:o:zyxel:gs1900-24_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Gs1900-24 » Version: N/A
Zyxel » Gs1900-8hp Firmware
Versions before (<) 2.70
cpe:2.3:o:zyxel:gs1900-8hp_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Gs1900-8hp » Version: N/A
Zyxel » Gs1900-10hp Firmware
Versions before (<) 2.70
cpe:2.3:o:zyxel:gs1900-10hp_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Gs1900-10hp » Version: N/A
Zyxel » Gs1900-16 Firmware
Versions before (<) 2.70
cpe:2.3:o:zyxel:gs1900-16_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Gs1900-16 » Version: N/A
Zyxel » Gs1900-24e Firmware
Versions before (<) 2.70
cpe:2.3:o:zyxel:gs1900-24e_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Gs1900-24e » Version: N/A
Zyxel » Gs1900-24hp Firmware
Versions before (<) 2.70
cpe:2.3:o:zyxel:gs1900-24hp_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Gs1900-24hp » Version: N/A
Zyxel » Gs1900-48 Firmware
Versions before (<) 2.70
cpe:2.3:o:zyxel:gs1900-48_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Gs1900-48 » Version: N/A
Zyxel » Gs1900-48hp Firmware
Versions before (<) 2.70
cpe:2.3:o:zyxel:gs1900-48hp_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Gs1900-48hp » Version: N/A
Zyxel » Gs1900-24ep Firmware
Versions before (<) 2.70
cpe:2.3:o:zyxel:gs1900-24ep_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Gs1900-24ep » Version: N/A
Zyxel » Gs1900-24hpv2 Firmware
Versions before (<) 2.70
cpe:2.3:o:zyxel:gs1900-24hpv2_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Gs1900-24hpv2 » Version: N/A
Zyxel » Gs1900-48hpv2 Firmware
Versions before (<) 2.70
cpe:2.3:o:zyxel:gs1900-48hpv2_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Gs1900-48hpv2 » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2021-35030

EPSS FAQ

0.04%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 6 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-35030

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
2.3	LOW	AV:A/AC:M/Au:S/C:N/I:P/A:N	4.4	2.9	NIST
Access Vector: Adjacent Network Access Complexity: Medium Authentication: Single Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
4.3	MEDIUM	CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N	1.2	2.7	NIST
Attack Vector: Adjacent Network Attack Complexity: Low Privileges Required: High User Interaction: Required Scope: Changed Confidentiality: Low Integrity: Low Availability: None
3.5	LOW	CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L	0.9	2.5	Zyxel Corporation
Attack Vector: Adjacent Network Attack Complexity: Low Privileges Required: High User Interaction: None Scope: Unchanged Confidentiality: None Integrity: Low Availability: Low

CWE ids for CVE-2021-35030

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

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Assigned by:
- nvd@nist.gov (Primary)
- security@zyxel.com.tw (Secondary)

References for CVE-2021-35030

https://www.zyxel.com/support/Zyxel_security_advisory_for_XSS_vulnerability_of_GS1900_series_switches.shtml

404 Error | Zyxel
Patch;Vendor Advisory

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Vulnerability Details : CVE-2021-35030

Products affected by CVE-2021-35030

Exploit prediction scoring system (EPSS) score for CVE-2021-35030

CVSS scores for CVE-2021-35030

CWE ids for CVE-2021-35030

References for CVE-2021-35030