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CVE-2021-31252

34
FAUCET Score

CVE-2021-31252 describes an open redirect vulnerability affecting various CHIYU Technology devices, including BF-630, BF-450M, BF-430, BF-431, BF631-W, BF830-W, Webpass, and SEMAC. This vulnerability, rated Medium severity (CVSS 6.1), allows an attacker to craft a malicious URL to redirect users to arbitrary websites, potentially leading to phishing or other social engineering attacks. While no active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion has been observed, users should remain vigilant against specially crafted links.

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:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:chiyu-tech:semac_s2_firmware:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:chiyu-tech:semac_d1_firmware:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
28.55%
Probability of exploitation in next 30 days
EPSS Percentile
97.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.2855 is in the 99th percentile among its peer group of 26,234 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 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 0.1 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.html
Vendor Advisory