CVE-2021-31251

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

35.71% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 98.3% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-06-04 20:25Z5 YR AGO

Last updated

2024-08-03 22:55Z2 YR AGO

Reserved

2021-04-15

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-287Improper AuthenticationClass

Data version

5.1

Document digest

e5216878debb83e9484b083ac1142707b40cb491eb7e9257bbaaf12ba93f3cae

• www.chiyu-tech.comhttps://www.chiyu-tech.com/msg/message-Firmware-update-87.htmlx_refsource_CONFIRM
• gitbook.seguranca-informatica.pthttps://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31251x_refsource_MISC
• seguranca-informatica.pthttps://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/#.YLqK1KhKguUx_refsource_MISC