CVE-2021-31643

Exp

An XSS vulnerability exists in several IoT devices from CHIYU Technology, including SEMAC, Biosense, BF-630, BF-631, and Webpass due to a lack of sanitization on the component if.cgi - username parameter.

Published: 2021-06-01 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-31643 is rated High Exploit Risk (76.5/100): CVSS Medium severity, with high exploitation likelihood (EPSS 88.45%, 100th percentile). 3 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +84.64% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2021-31643

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-31643

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 3.81% 88.45% +84.64%
2 2025-12-18 3.55% 3.81% +0.26%
3 2025-11-21 — 3.55% —

Full EPSS history (23 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-31643

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.4 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.3 2.7 [email protected]
3.5 2.0 LOW
AV:N/AC:M/Au:S/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 6.8 2.9 [email protected]

Weakness enumeration for CVE-2021-31643

Affected software / configurations for CVE-2021-31643

Vendor Product Version Raw CPE
chiyu-tech bf-631_firmware — cpe:2.3:o:chiyu-tech:bf-631_firmware:-:*:*:*:*:*:*:*
chiyu-tech bf-630_firmware — cpe:2.3:o:chiyu-tech:bf-630_firmware:-:*:*:*:*:*:*:*
chiyu-tech semac_s2_firmware — cpe:2.3:o:chiyu-tech:semac_s2_firmware:-:*:*:*:*:*:*:*
chiyu-tech semac_d1_firmware — cpe:2.3:o:chiyu-tech:semac_d1_firmware:-:*:*:*:*:*:*:*
chiyu-tech semac_d2_firmware — cpe:2.3:o:chiyu-tech:semac_d2_firmware:-:*:*:*:*:*:*:*
chiyu-tech semac_d4_firmware — cpe:2.3:o:chiyu-tech:semac_d4_firmware:-:*:*:*:*:*:*:*
chiyu-tech semac_s3v3_firmware — cpe:2.3:o:chiyu-tech:semac_s3v3_firmware:-:*:*:*:*:*:*:*
chiyu-tech semac_d2_n300_firmware — cpe:2.3:o:chiyu-tech:semac_d2_n300_firmware:-:*:*:*:*:*:*:*
chiyu-tech semac_s1_osdp_firmware — cpe:2.3:o:chiyu-tech:semac_s1_osdp_firmware:-:*:*:*:*:*:*:*
chiyu-tech webpass_firmware — cpe:2.3:o:chiyu-tech:webpass_firmware:-:*:*:*:*:*:*:*
chiyu-tech biosense_firmware — cpe:2.3:o:chiyu-tech:biosense_firmware:-:*:*:*:*:*:*:*

References for CVE-2021-31643

cvelogic Threat Intelligence