What’s Vulnerable › Vulnerabilities

CVE-2021-27811

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-21 · updated 2026-06-17
• Weakness: CWE-94

Description

A code injection vulnerability has been discovered in the Upgrade function of QibosoftX1 v1.0. An attacker is able execute arbitrary PHP code via exploitation of client_upgrade_edition.php and Upgrade.php.

Affected products

• Qibosoft: 1.0

References

• https://github.com/whiskey-jj/w2s2x2222.github.io/issues/2
• https://www.cnvd.org.cn/flaw/show/2297879
• https://github.com/whiskey-jj/w2s2x2222.github.io/issues/2
• https://www.cnvd.org.cn/flaw/show/2297879

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