# CVE-2021-21311: adminer: Adminer is an open-source database management in a single PHP file

CVE-2021-21311 is fixed in adminer on 1 platform, first by adminer 4.6.2-1ubuntu0.1~esm1, released May 19, 2021. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on September 29, 2025. Patch Radar priority: Patch now.

- Web page: https://patchblox.com/security/cve/CVE-2021-21311
- Priority: Patch now
- CVSS: n/a (Medium)
- EPSS: 0.9846
- CISA KEV: listed Sep 29, 2025, federal due date Oct 20, 2025
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 11, 2021

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | adminer Ubuntu 18.04.6 LTS (bionic) | 4.6.2-1ubuntu0.1~esm1 | [adminer 4.6.2-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-adminer-4.6.2-1ubuntu0.1-esm1.md) | May 19, 2021 |
| Linux | adminer Ubuntu 20.04 LTS (focal) | 4.7.6-1ubuntu0.1~esm1 | [adminer 4.7.6-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-adminer-4.7.6-1ubuntu0.1-esm1.md) | May 19, 2021 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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