CVE-2021-27811
HIGHCVSS 7.2/10EPSS 1.20%
Last modified
CVE-2021-27811 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. 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.. EPSS estimates a 1.20% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Qibosoft | Qibosoft | 1.0 |
References
- https://github.com/whiskey-jj/w2s2x2222.github.io/issues/2Exploit, Issue Tracking, Third Party Advisory
- https://www.cnvd.org.cn/flaw/show/2297879Third Party Advisory
- https://github.com/whiskey-jj/w2s2x2222.github.io/issues/2Exploit, Issue Tracking, Third Party Advisory
- https://www.cnvd.org.cn/flaw/show/2297879Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-27811?
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.
How severe is CVE-2021-27811?
CVE-2021-27811 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 1.20% probability of exploitation in the next 30 days.
How do I fix CVE-2021-27811?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-27811?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST