CVE-2021-21311VulnerabilityPublished 09/29/2025Updated 10/24/2026
CVE-2021-21311: Adminer Server-Side Request Forgery Vulnerability
Affects Adminer AdminerSource CISA KEV
Severity
HighNo CVSS score published yet
- Exploitation
Actively exploited – in CISA KEV since 09/29/2025
- KEV deadline
- 10/20/2025
- EPSS
- 98.5% chance of exploitation in 30 days – higher than 99% of CVEs
What to do
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.
Description
Adminer contains a server-side request forgery vulnerability that, when exploited, allows a remote attacker to obtain potentially sensitive information.