CVE-2021-21311

HIGH7.2

CISA KEV

Published 2021-02-11 · Updated 2026-06-17 · Source security-advisories@github.com

Summary

CVE-2021-21311 is a high-severity (CVSS 7.2) vulnerability in Adminer Adminer. CISA added it to the Known Exploited Vulnerabilities catalog on September 29, 2025, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by October 20, 2025. CISA does not currently list it as used in ransomware campaigns.

All 1 known-exploited Adminer vulnerabilities →

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.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CWE-918

CISA Known-Exploited Vulnerability

Product: Adminer — Adminer

Name: Adminer Server-Side Request Forgery Vulnerability

Date added: 2025-09-29 · Due: 2025-10-20

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.

References

View on NVD

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