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Actively exploited · Published Feb 11, 2021 · Assigned by GitHub_M

CVE-2021-21311SSRF in adminer

High 7.2 Exploited

In plain English

A high-severity server-side request forgery in adminer from vrana. Attackers are actively exploiting it in the wild (listed by CISA on September 29, 2025). The chance it is exploited in the next 30 days is estimated at 98.5% (higher than 99.9% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.2High
Exploit odds (30 days)98.5%top 0.1% of all CVEs
Exploited in the wildYesCISA KEV since Sep 29, 2025
Attack tooling2Nuclei, Public PoC

CISA guidance

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Federal agencies must remediate by Oct 20, 2025.

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12adminer4.7.9-1DEBIAN-CVE-2021-21311
Debian:13adminer4.7.9-1DEBIAN-CVE-2021-21311
Debian:14adminer4.7.9-1DEBIAN-CVE-2021-21311
Packagistvrana/adminer4.7.9GHSA-x5r2-hj5c-8jx6

Affected products (as reported)

VendorProductVersions
vrana adminer >= 4.0.0, < 4.7.9

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

References