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CVE-2021-21311

Adminer — Adminer Server-Side Request Forgery Vulnerability

Adminer · CWE-918 — Server-side request forgery · in CISA KEV since 2025-09-29

KEV since 2025 · listed over a yearCISA KEVActively Exploited
84

EVRS 84 of 100 Urgent

Patch This Cycle

Rank 471 of 2,954 tracked

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Why it scores 84

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and an EPSS probability of 0.985.

  • CISA KEVApplied
  • RansomwareDid not apply
  • Vendor exploitationDid not apply
  • EPSSApplied
  • Microsoft Exploitability IndexNot applicable
  • Pre-patch disclosureNo data
  • KEV recencyDid not apply
  • CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

Patch or fixed version identified

CISA required action

Fixed in

  • vrana/adminer4.7.9

Affected versions

  • vrana/adminer (composer)affected < 4.7.9, fixed in 4.7.9

Remediation

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

Fixed versions from NVD and GitHub. Affected packages also in GitHub Advisory GHSA-x5r2-hj5c-8jx6 (CC BY 4.0).

Evidence

Each value with its source
MeasureValueSource
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. 7.2 NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. 0.985 (99.92nd pctl) FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild. Confirmed CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it. Unknown or none CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. 2025-10-20 · KEV since 2025 · listed over a year CISA KEV
Public exploit moduleA module existing is not the same as active exploitation. None known Metasploit
EUVD cross-referenceENISA's record: CVSS 7.2 (v3.1), assigned by GitHub_M. Listed ENISA EUVD

Description

NVD

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.

What CISA says to do