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CVE-2021-31250

72
FAUCET Score

CVE-2021-31250 describes multiple stored Cross-Site Scripting (XSS) vulnerabilities in CHIYU Technology Inc.'s BF-430, BF-431, and BF-450M TCP/IP Converter devices, stemming from insufficient input sanitization in several CGI components. Rated 5.4 MEDIUM, this vulnerability requires low privileges and user interaction (UI:R) for an attacker to achieve low impact on confidentiality and integrity. While not actively exploited (KEV: No) and lacking public exploit code on Metasploit or ExploitDB, Nuclei templates exist, and it has garnered minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:chiyu-tech:bf-430_firmware:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:chiyu-tech:bf-431_firmware:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:chiyu-tech:bf-450m_firmware:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.4MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.3
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
79.61%
Probability of exploitation in next 30 days
EPSS Percentile
99.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Nuclei: CVE-2021-31250 · Jul 26, 2021
This CVE's current EPSS score of 0.7961 is in the 100th percentile among its peer group of 15,225 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

gitbook.seguranca-informatica.pt / cve-and-exploits/cves/chiyu-iot-devices
ExploitThird Party Advisory
seguranca-informatica.pt / dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks
ExploitThird Party Advisory
chiyu-tech.com / msg/message-Firmware-update-87.htm
Vendor Advisory