CVE-2021-21311
HighActively exploited (CISA KEV)
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.
SeverityHigh
CVSS7.2
Exploit probability—
Product
Adminer
PublishedFeb 11, 2021
First seenFeb 11, 2021
Added to KEVSep 29, 2025
Weakness typeCWE-918Server-side request forgery (SSRF)
How to fix
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA due date: Oct 20, 2025Update
- adminer adminer4.7.9 or later
- vrana/adminer4.7.9 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| adminer adminer | 4.0.0 ≤ v < 4.7.9 | 4.7.9 |
| debian debian_linux | 9.0 | — |
| vrana/adminerPackagist | v < 4.7.9 | 4.7.9 |
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