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CVE-2021-21311

Adminer Server-Side Request Forgery

7.2 HIGHActively exploited (CISA KEV)Public exploitEPSS 98.5%
  1. Published11 Feb 2021
  2. Added to CISA KEV29 Sept 2025
  3. Remediation due20 Oct 2025
Actively exploited (CISA KEV)

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

Added to KEV: 29 Sept 2025Federal remediation due: 20 Oct 2025

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Affected products

Adminer≥ 4.0.0 < 4.7.9
Debian Linux9.0

Remediation

Fixed in
Adminer≥ 4.7.9

References

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Frequently asked

Is CVE-2021-21311 being actively exploited?

Yes. CVE-2021-21311 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 29 Sept 2025.

How severe is CVE-2021-21311?

CVE-2021-21311 has a CVSS 3.1 base score of 7.2, rated high. EPSS estimates a 98.5% probability of exploitation.

Which products are affected by CVE-2021-21311?

Affected products include Adminer, Debian Linux.

How do I fix CVE-2021-21311?

Upgrade affected software to a fixed version, for example Adminer 4.7.9 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-21311 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.