CVE-2021-31250
MediumExploitedMultiple storage XSS vulnerabilities were discovered on BF-430, BF-431 and BF-450M TCP/IP Converter devices from CHIYU Technology Inc due to a lack of sanitization of the input on the components man.cgi, if.cgi, dhcpc.cgi, ppp.cgi.
Published Jun 4, 2021 · Updated Nov 21, 2024
Key Facts
Patch immediately- CVE-2021-31250 is a medium-severity vulnerability (CVSS 5.4 v3.1) affecting Bf-430 Firmware (Chiyu-Tech), Bf-431 Firmware (Chiyu-Tech), Bf-450m Firmware (Chiyu-Tech).
- It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Apr 8, 2024. No public exploit code is known.
- EPSS estimates a 80% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
5.4
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
EPSS (30-day exploit likelihood)
80%
Higher than 99.6% of all scored CVEs
Exploited in the wild
Yes
2 catalog listings
Public exploit code
None known
Get the full CVE-2021-31250 brief as a PDF
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Description
Multiple storage XSS vulnerabilities were discovered on BF-430, BF-431 and BF-450M TCP/IP Converter devices from CHIYU Technology Inc due to a lack of sanitization of the input on the components man.cgi, if.cgi, dhcpc.cgi, ppp.cgi.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Apr 8, 2024 | n/a | Not reported |
| CIRCL KEV | Apr 8, 2024 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Bf-430 FirmwareChiyu-Tech | See advisory | n/a |
| Bf-431 FirmwareChiyu-Tech | See advisory | n/a |
| Bf-450m FirmwareChiyu-Tech | See advisory | n/a |
Timeline
Publicly disclosed
Jun 4, 2021
Added to Industry KEV feed
Apr 8, 2024
Added to CIRCL KEV
Apr 8, 2024
Last updated
Nov 21, 2024
Weakness Type
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
References
- advisoryhttps://www.chiyu-tech.com/msg/message-Firmware-update-87.htm
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
Multiple storage XSS vulnerabilities were discovered on BF-430, BF-431 and BF-450M TCP/IP Converter devices from CHIYU Technology Inc due to a lack of sanitization of the input on the components man.cgi, if.cgi, dhcpc.cgi, ppp.cgi.
Affected: Bf-430 Firmware (Chiyu-Tech); Bf-431 Firmware (Chiyu-Tech); Bf-450m Firmware (Chiyu-Tech). The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Apr 8, 2024.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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