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CVE-2021-21311 CISA KEV high

[KEV] SSRF (Server-Side Request Forgery) in Adminer (CVE-2021-21311)

Summary

SSRF in Adminer (CVE-2021-21311). Risk of unauthorized operations or information disclosure. Exploitable via adminer.php. Listed in CISA KEV — actively exploited.

Original description

The description as published by the source.

Impact

Users of Adminer versions bundling all drivers (e.g. adminer.php) are affected.

Patches

Patched by ccd2374b, included in version 4.7.9.

Workarounds

  • Use a single driver version (e.g. adminer-mysql.php).
  • Protect access to Adminer also by other means, e.g. by HTTP password, IP address limiting or by OTP plugin.

References

https://github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdf

For more information

If you have any questions or comments about this advisory:

  • Comment at ccd2374b.

Source: CISA Known Exploited Vulnerabilities NVD GitHub Advisory CISA KEV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2021-21311 has been found in Adminer.
Attackers can target a specific entry point like adminer.php over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
Note: CISA has officially confirmed this is actively exploited in the wild. Treat it with elevated urgency.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Adminer CVE-2021-21311" on the vendor's site.

CVE-2021-21311 (Adminer) — CWE-918
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: adminer.php
Listed in CISA KEV — actively exploited, treat as top priority.
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

SSRF (CWE-918) exists in Adminer. Attackers reach the vulnerable code path via adminer.php without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of Adminer. Attack surface: adminer.php.

🔥 Severity

Severity: High. Risk of unauthorized operations or information disclosure. Listed in CISA KEV — actively exploited in the wild, treat as top priority.

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Adminer' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'Adminer' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で Adminer を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Consider incident declaration escalate 
    Notify SOC / on-call

    CISA KEV登録済 = 実環境で悪用が観測されている。侵入の兆候があればインシデント対応宣言、無くてもパッチ適用までWAF強化を最優先で。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

Packagist vrana/adminer
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.7.9"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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