CVE-2021-31642

MEDIUM
6.5
CVSS Score
Published: June 1, 2021 at 02:13 PM UTC
Updated: June 17, 2026 at 03:52 AM UTC
22 products affected across 1 vendorSemac S1 Osdp FirmwareSemac S2 FirmwareSemac D1 Firmware

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Severity
MEDIUM6.5
Exploit prediction
EPSS 44%

Description

A denial of service condition exists after an integer overflow in several IoT devices from CHIYU Technology, including BIOSENSE, Webpass, and BF-630, BF-631, and SEMAC. The vulnerability can be explored by sending an unexpected integer (> 32 bits) on the page parameter that will crash the web portal and making it unavailable until a reboot of the device.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
chiyu-tech-bf-630 (same device)
All versions
chiyu-tech-bf-631 (same device)
All versions
chiyu-tech-biosense (same device)
All versions
chiyu-tech-semac-d1 (same device)
All versions
chiyu-tech-semac-d2 (same device)
All versions
chiyu-tech-semac-d2-n300 (same device)
All versions
chiyu-tech-semac-d4 (same device)
All versions
chiyu-tech-semac-s1-osdp (same device)
All versions
chiyu-tech-semac-s2 (same device)
All versions
chiyu-tech-semac-s3v3 (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-190

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