CVE-2021-21311
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National Vulnerability Database Information
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 Base Score: 7.2 (v3.1)
The **CVSS Base Score** is a score from **0 to 10** that represents the intrinsic severity of a vulnerability. A higher score indicates greater severity.
0.02.55.07.510.0
Published on: 02/11/2021 21:15:13
Last modified: 10/24/2025 14:48:35
NIST: CVE source from the National Vulnerability Database (NVD)
CVSS Metrics Details
- Base Severity: HIGH
- Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- Attack Vector: NETWORK
- Attack Complexity: LOW
- Privileges Required: NONE
- User Interaction: NONE
- Scope: CHANGED
- Confidentiality Impact: LOW
- Integrity Impact: LOW
- Availability Impact: NONE
FIRST Information
EPSS Score: 0.9375
The **EPSS (Exploit Prediction Scoring System)** is a score from **0 to 1** that indicates the **probability** that a vulnerability will be exploited in the real world in the next 30 days. A higher value indicates a greater likelihood of exploitation.
0.00.250.50.751.0
Percentile: 0.9984
The **Percentile** indicates how much higher this vulnerability's EPSS score is compared to all other vulnerabilities in the EPSS database. For example, a percentile of 0.90 (90%) means that 90% of vulnerabilities have an EPSS score equal to or lower than the current one.
0.00.250.50.751.0
*Data updated as of: 2025-10-26
CISA Information (Known Exploited Vulnerabilities)
The **CISA KEV Catalog** lists vulnerabilities that have been **actively exploited in the real world**. If a CVE is present in this catalog, it indicates that the threat is immediate and mitigation should be a top priority.
CVE **CVE-2021-21311** **IS PRESENT** in the CISA KEV Catalog!
- Vulnerability Name: Adminer Server-Side Request Forgery Vulnerability
- Short Description: Adminer contains a server-side request forgery vulnerability that, when exploited, allows a remote attacker to obtain potentially sensitive information.
- Date Added to KEV: 09/29/2025
- Vendor/Product: Adminer / Adminer
- 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.
- Due Date: 10/20/2025
Articles published on Red Hot Cyber
Exploit PoC from GitHub
- llhala/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.
- omoknooni/CVE-2021-21311:
