CVE-2021-21311 on CISA KEV

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.

01What CISA says about this vulnerability

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.

02Required action — verbatim from CISA

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

03Notes & references

• github.com — https://github.com/vrana/adminer/security/advisories/GHSA-x5r2-hj5c-8jx6
• github.com — https://github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdf
• packagist.org — https://packagist.org/packages/vrana/adminer
• github.com — https://github.com/vrana/adminer/commit/ccd2374b0b12bd547417bf0dacdf153826c83351
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2021/03/msg00002.html

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
vrana	adminer	>= 4.0.0, < 4.7.9

06Detection

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