What’s Vulnerable › Vulnerabilities

CVE-2021-21311: Adminer Server-Side Request Forgery Vulnerability

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2025-09-29
• EPSS: 98.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-02-11 · updated 2026-06-17
• Weakness: CWE-918

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.

Affected products

• vrana adminer: from 4.0.0 before 4.7.9 — fixed in 4.7.9
• Debian Linux: 9.0

How to fix

Upgrade to a fixed version: vrana adminer 4.7.9. Check the vendor advisory for mitigations.

References

• https://github.com/vrana/adminer/commit/ccd2374b0b12bd547417bf0dacdf153826c83351
• https://github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdf
• https://github.com/vrana/adminer/security/advisories/GHSA-x5r2-hj5c-8jx6
• https://lists.debian.org/debian-lts-announce/2021/03/msg00002.html
• https://packagist.org/packages/vrana/adminer
• https://github.com/vrana/adminer/commit/ccd2374b0b12bd547417bf0dacdf153826c83351
• https://github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdf
• https://github.com/vrana/adminer/security/advisories/GHSA-x5r2-hj5c-8jx6
• https://lists.debian.org/debian-lts-announce/2021/03/msg00002.html
• https://packagist.org/packages/vrana/adminer
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21311

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