Adminer Server-Side Request Forgery Vulnerability

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

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• cpe adminer/adminerversion unspecified
• cpe debian/debian linux9.0
• vendor Adminer Adminerversion unspecified

How to fix CVE-2021-21311

• Recommended 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. CISA due date Oct 20, 2025.

• Official advisories

  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • VulnCheck KEV · vulncheck.com

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. Feb 11, 2021 · Catalog

   Detected

   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. ) are affected. This is fixed in version 4.7.9.

2. Sep 29, 2025 · CISA KEV

   Known exploited

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

3. Oct 20, 2025 · CISA KEV

   Remediation due

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

4. Jun 16, 2026 · Catalog

   Updated

   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. ) are affected. This is fixed in version 4.7.9.

Sources

• CISA KEVConfirmed exploitationCVE-2021-21311

  Adminer contains a server-side request forgery vulnerability that, when exploited, allows a remote attacker to obtain potentially sensitive information.

  cisa.gov
• CVE.orgVulnerability recordCVE-2021-21311

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2021-21311

  30-day exploitation probability 98.5%

  first.org
• NIST NVDVulnerability recordCVE-2021-21311

  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. ) are affected. This is fixed in version 4.7.

  nvd.nist.gov
• VulnCheck KEVConfirmed exploitationCVE-2021-21311

  Adminer contains a server-side request forgery vulnerability that, when exploited, allows a remote attacker to obtain potentially sensitive information.

  vulncheck.com

References

• VulnCheck exploitation evidence · cloud.google.com
• VulnCheck exploitation evidence · dashboard.shadowserver.org
• Patch · github.com
• Exploit · github.com
• CISA note · github.com
• Mailing List · lists.debian.org
• CISA note · nvd.nist.gov
• Product · packagist.org
• VulnCheck exploitation evidence · cisa.gov
• VulnCheck exploitation evidence · loginsoft.com
• VulnCheck exploitation evidence · rapid7.com
• VulnCheck exploitation evidence · recordedfuture.com

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.