CVE-2021-21311
CVSS v3
7.2
HIGH
EPSS Score
94.2 %
exploit probability
CISA KEV
Yes
known exploited
Exploitation
—
SSVC status
Description
Adminer is an open-source database management in a single PHP file. In adminer from version 4.0.0 and before 4.7.9 there is a server-side request forgery vulnerability. Users of Adminer versions bundling all drivers (e.g. `adminer.php`) are affected. This is fixed in version 4.7.9.
CISA Known Exploited Vulnerability
- Date Added
- 2025-09-29
- Patch Due Date
- 2025-10-20
- Ransomware Use
- Unknown
Technical details
- Published
- 2021-02-11
Frequently asked questions
What is CVE-2021-21311?
Adminer is an open-source database management in a single PHP file. In adminer from version 4.0.0 and before 4.7.9 there is a server-side request forgery vulnerability. Users of Adminer versions bundling all drivers (e.g. `adminer.php`) are affected. This is fixed in version 4.7.9.
Is CVE-2021-21311 actively exploited?
Yes. CVE-2021-21311 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2025-10-20.
What is the CVSS score for CVE-2021-21311?
CVE-2021-21311 has a CVSS v3 base score of 7.2 (HIGH severity).
Is CVE-2021-21311 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.
No credit card required · 500 free checks/month · Free API key
Other 2021 vulnerabilities worth triaging
Ranked by exploit probability (EPSS).