Adminer Server-Side Request Forgery Vulnerability
vrana — adminer
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.
7.2
90.5%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- Published
- Feb 11, 2021
- Modified
- Oct 21, 2025
- Added to KEV
- Sep 29, 2025
- Federal patch due
- Oct 20, 2025
CISA 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.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2021-21311, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit — cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2021-21311 were found at last check. Absence here is not proof no exploit exists — see the references below for vendor advisories and write-ups.
References
How this class of flaw gets exploited
Frequently asked questions
What is CVE-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. `adminer.php`) are affected. This is fixed in version 4.7.9.
How severe is CVE-2021-21311?
CVE-2021-21311 has a CVSS base score of 7.2 out of 10 (CVSS 3.1).
Is CVE-2021-21311 actively exploited in the wild?
Yes. CVE-2021-21311 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Sep 29, 2025, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2021-21311?
90.5% - meaning FIRST.org's EPSS model estimates a 90.5% probability this vulnerability will be exploited in the wild within 30 days (100% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2021-21311?
Yes - a public Nuclei template referencing CVE-2021-21311 exist in public repositories we checked.
What type of vulnerability is CVE-2021-21311?
CVE-2021-21311 is classified under CWE-918 (CWE-918: Server-Side Request Forgery (SSRF)).
Cross-checked against
Impactr finds and proves whether CVE-2021-21311 — or flaws like it — are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.