CVE-2021-21311
SSRF in adminer
- Published
- Feb 11, 2021
- Updated
- Oct 21, 2025
- Assigning CNA
- GitHub_M
- Evidence observed
- Sep 29, 2025
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:NHigh · next 30 days
- Percentile
- 99.8%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
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.
Sources
2Proof-of-concept exploit for CVE-2021-21311, an SSRF vulnerability in Adminer database management tool versions 4.0.0–4.7.8. Includes a Python exploit script with redirect and listener options for security research and testing.
Proof-of-concept for CVE-2021-21311, a server-side request forgery in Adminer before 4.7.9, demonstrating SSRF exploitation in PHP database management tool.
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