What is the CVSS score of CVE-2021-31641?

CVE-2021-31641 has a CVSS 3.1 base score of 6.1 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 5.1%.

Is there a public PoC exploit available for CVE-2021-31641?

Yes, a public proof-of-concept exploit is available for CVE-2021-31641. Prioritise patching immediately. EPSS: 5.1%.

Bf 430 Firmware CVE-2021-31641

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2021-06-01 cve@mitre.org

XSS Bf 430 Firmware Bf 431 Firmware Bf 450M Firmware Semac S2 Firmware Semac D1 Firmware Semac D2 Firmware Semac D4 Firmware Semac S3V3 Firmware Semac D2 N300 Firmware Semac S1 Osdp Firmware Bf 630 Firmware Bf 631W Firmware Bf 830W Firmware Webpass Firmware Bfminiw Firmware

6.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.1 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Low

Integrity

Low

Availability

None

Lifecycle Timeline

CVE Published

Jun 01, 2021 - 15:15 nvd

MEDIUM 6.1

DescriptionNVD

AnalysisAI

An unauthenticated XSS vulnerability exists in several IoT devices from CHIYU Technology, including BF-630, BF-450M, BF-430, BF-431, BF631-W, BF830-W, Webpass, BF-MINI-W, and SEMAC due to a lack of. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. An unauthenticated XSS vulnerability exists in several IoT devices from CHIYU Technology, including BF-630, BF-450M, BF-430, BF-431, BF631-W, BF830-W, Webpass, BF-MINI-W, and SEMAC due to a lack of sanitization when the HTTP 404 message is generated. Affected products include: Chiyu-Tech Bf-430 Firmware, Chiyu-Tech Bf-431 Firmware, Chiyu-Tech Bf-450M Firmware, Chiyu-Tech Semac S2 Firmware, Chiyu-Tech Semac D1 Firmware.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.