Cyber Resilience

CVE-2021-31642

MediumPublic PoC

Published: 01 June 2021

Published
01 June 2021
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.2135 95.8th percentile
Risk Priority 26 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-31642 is a medium-severity Integer Overflow or Wraparound (CWE-190) vulnerability in Chiyu-Tech Semac S2 Firmware. Its CVSS base score is 6.5 (Medium).

Operationally, ranked in the top 4.2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

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…

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page parameter that will crash the web portal and making it unavailable until a reboot of the device.

CWE(s)
CWE-190

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

chiyu-tech
semac s2 firmware
all versions
chiyu-tech
semac d1 firmware
all versions
chiyu-tech
semac d2 firmware
all versions
chiyu-tech
semac d4 firmware
all versions
chiyu-tech
semac s3v3 firmware
all versions
chiyu-tech
semac d2 n300 firmware
all versions
chiyu-tech
semac s1 osdp firmware
all versions
chiyu-tech
bf-631 firmware
all versions
chiyu-tech
bf-630 firmware
all versions
chiyu-tech
webpass firmware
all versions
+1 more product configuration(s) — see NVD for full list

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References