CVE-2021-21311
SSRF in adminer
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.
No summary for this CVE yet.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:LAttack ComplexityLow
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:CScopeChanged
Impact
C:LConfidentialityLow
I:LIntegrityLow
A:NAvailabilityNone
Weaknesses
Affected Products
vrana
oss-projectaka adminer
adminer
oss-projectaka admin er
debian
oss-project·GBaka debian gnu/linux
Сообщество свободного программного обеспечения
oss-projectaka fsf
Packagist
package-ecosystem
Exploitability
CISA Known Exploited Vulnerability
Added to KEV:Sep 29, 2025
Remediation due:Oct 20, 2025
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.
Official Patch Available
Attack Graph
Products CVE Techniques Tactics
Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.
MITRE ATT&CK
2 techniques Command and Control
Initial Access
References
https://github.com/vrana/adminer/security/advisories/GHSA-x5r2-hj5c-8jx6
github.com
https://github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdf
github.com
https://packagist.org/packages/vrana/adminer
packagist.org
and 9 more references View all →
Unlock Complete Vulnerability Intelligence
Get the full picture for CVE-2021-21311 and every CVE in our database. Create a free account — no credit card required.
Create Free AccountPlain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows