Which products and versions are affected by CVE-2021-31642?

Affected: Bf-630 Firmware (Chiyu-Tech); Bf-631 Firmware (Chiyu-Tech); Biosense Firmware (Chiyu-Tech), among others. The full list is in the CVE brief.

Is CVE-2021-31642 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2021-31642 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2021-31642?

Public exploit code is available.

Is there a fix for CVE-2021-31642?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2021-31642 be patched?

Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.

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CVE-2021-31642Bf-630 Firmware Integer Overflow

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.

Published Jun 1, 2021 · Updated Nov 21, 2024

Key Facts

Routine patching

CVE-2021-31642 is a medium-severity vulnerability (CVSS 6.5 v3.1) affecting Bf-630 Firmware (Chiyu-Tech), Bf-631 Firmware (Chiyu-Tech), Biosense Firmware (Chiyu-Tech) and 8 more products.
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 44% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.

Scores

CVSS v3.1

6.5

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

EPSS (30-day exploit likelihood)

44%

Higher than 98.7% of all scored CVEs

Exploit maturity

Proof of concept

ATLAS score

38/100

Publication score, see How it works

Exploitation Verdict

KEV listed

Not listed

Federal due date

None

No federal due date

Ransomware use

Not reported

Attributed actors

None named

Exploit & Defence Guidance

Exploit maturity

Proof of concept

Public exploit code

Proof-of-concept links

In-the-wild evidence

Reports of active use

Advisories And Exploit References

advisoryhttps://www.chiyu-tech.com/msg/message-Firmware-update-87.html

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 Products

11 affected entries in total

Product	Affected versions	Fixed in
Bf-630 FirmwareChiyu-Tech	See advisory	n/a
Bf-631 FirmwareChiyu-Tech	See advisory	n/a
Biosense FirmwareChiyu-Tech	See advisory	n/a
Semac D1 FirmwareChiyu-Tech	See advisory	n/a
Semac D2 FirmwareChiyu-Tech	See advisory	n/a

6 more affected products in the full CVE brief

Timeline

Publicly disclosed
Jun 1, 2021
Last updated
Nov 21, 2024

Weakness Type

CWE-190 Integer Overflow or Wraparound

References

FAQ

Common Questions.

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.
Affected: Bf-630 Firmware (Chiyu-Tech); Bf-631 Firmware (Chiyu-Tech); Biosense Firmware (Chiyu-Tech), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.

Is CVE-2021-31642 On Your Attack Surface?

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