Oct 20, 2026 · 17:55 UTC SEARCH
UNRATED KNOWN EXPLOITED
Vulnerability intelligence

CVE-2021-21311

VendorAdminer
ProductAdminer
Known exploitedYes
Added to CISA KEVSeptember 29, 2025
KEV due dateOctober 20, 2025
Known ransomware useNot identified by CISA

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

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.

CISA KEV status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities Catalog. Known ransomware campaign use: Unknown.

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