What is CVE-2021-26634?

CVE-2021-26634 is a critical-severity vulnerability in Linux Kernel, classified under SQL Injection. CVSS score: 9.8/10. Published 2022-06-02.

How severe is CVE-2021-26634?

Critical severity. CVSS v3 base score is 9.8 out of 10.

SQL Injection in Linux Kernel

CVE-2021-26634

SQL injection and file upload attacks are possible due to insufficient validation of input values in some parameters and variables of files compromising Maxboard, which may lead to arbitrary code execution or privilege escalation. Attackers can use these vulnerabilities to perform attacks such as stealing server management rights using a web shell.

Vulnerability class: SQL Injection

Published 2022-06-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.013 (69.8th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 69.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: +0.000

Affected products

Linux Kernel
Maxb Maxboard
Max Yi Maxboard — versions unspecified

Weakness classification (CWE)

References

www.krcert.or.kr/krcert/secNoticeView.do (Third Party Advisory, Broken Link)

Frequently asked questions

What is CVE-2021-26634?: CVE-2021-26634 is a critical-severity vulnerability in Linux Kernel, classified under SQL Injection. CVSS score: 9.8/10. Published 2022-06-02.
How severe is CVE-2021-26634?: Critical severity. CVSS v3 base score is 9.8 out of 10.