Vulnerability Report

CVE-2021-21311

CISA KEV Active

Title: Adminer Server-Side Request Forgery

SSRF

Proof Of Concept

PoC Available for CVE-2021-21311

CWE Category CWE-918
Published Date Feb 11, 2021
Modified Date Oct 24, 2025
Exploit Status Available
Score 7.2 CVSS v3.1
Exploit Probability (EPSS)
94.11%

Vulnerability Summary

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.

Impacted Vendors

A
adminer 1

Reference Links

https://github.com/vrana/adminer/commit/ccd2374b0b12bd547417bf0dacdf153826c83351 https://github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdf https://github.com/vrana/adminer/security/advisories/GHSA-x5r2-hj5c-8jx6 https://lists.debian.org/debian-lts-announce/2021/03/msg00002.html https://packagist.org/packages/vrana/adminer https://github.com/vrana/adminer/commit/ccd2374b0b12bd547417bf0dacdf153826c83351 https://github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdf https://github.com/vrana/adminer/security/advisories/GHSA-x5r2-hj5c-8jx6 https://lists.debian.org/debian-lts-announce/2021/03/msg00002.html https://packagist.org/packages/vrana/adminer https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21311
CVSS v3.1
Source Entity [email protected]
Severity HIGH
7.2
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CVSS v3.1
Source Entity [email protected]
Severity HIGH
7.2
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CVSS v2.0
Source Entity [email protected]
Severity MEDIUM
6.4
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:N/AC:L/Au:N/C:P/I:P/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2021-21311 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/llhala/CVE-2021-21311
View Code
GitHub https://github.com/omoknooni/CVE-2021-21311
View Code
MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Affected Stack

No specific products linked.