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CVE-2021-21311

Server-Side Request Forgery (SSRF): Is CVE-2021-21311 real, exploitable, or a false positive? Here's the community verdict.

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signals

public sources

Exploited in wild
Yes
CISA KEV · Sep 29, 2025
Public exploit
PoC (unverified)
Metasploit/EDB/PoC
Base severity
7.2 High
CVSS
Exploitation prob.
98%
FIRST EPSS
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
CWE

Confirmed exploited in the wild. Patch this first, regardless of the base score.

cisa ssvc

CISA Vulnrichment · assessed

Exploitation
Active
in the wild
Automatable
Yes
at scale
Technical impact
Partial
on success

CISA decision, by how critical the affected system is to you:

  • low impact → Attend
  • medium impact → Attend
  • high impact → Act

Track: normal patch cycle · Track*: watch closely · Attend: patch sooner · Act: patch now. About SSVC ↗

public exploits

links to sources — we don’t host code
GitHub PoC(3)unverified

Unverified proof-of-concept code has been published. It may or may not be functional — assess before relying on it.

affected packages

GHSA-x5r2-hj5c-8jx6 · GitHub rates it high
  • Composervrana/adminer
    Vulnerable
    < 4.7.9
    Fixed in
    4.7.9

Source: GitHub Advisory Database (CC-BY 4.0), via OSV.dev. Check your lockfile version against the ranges above.

baseline read

auto · not a community verdict

Real — exploited in the wild

CISA confirms active exploitation. Treat scanner hits as true positives unless your specific version or config is unaffected.

Based on CISA KEV

Confirm or dispute →
Affected:AdminerDebian

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

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.

References

NVD MITRE CVE.org CISA KEV VulnCheck KEV

Published · Added to CISA KEV (1691 days after publication)

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timeline

  1. Added to CISA KEV · confirmed exploited in the wild
  2. CISA SSVC assessment · exploitation: active
  3. Added to VulnCheck KEV · reported exploited in the wild
  4. Published by NVD

Score and exploit changes tracked since .

Community ground truth

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In your experience, is this finding real and exploitable?

awaiting field verdicts
Real, but not a risk here
Not a real issue

Curated baseline: TruePositive's read from public sources is Real & exploitable — a starting point, not a community verdict.

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Field notes & remediation

Verdicts are the quick signal. Notes are the evidence and fixes behind them.

  • 0
    Field note · TruePositive EditorialCurated

    This is confirmed exploited in the wild. It is in the CISA KEV catalog, so attackers are actively using it, not just researchers. It is reachable over the network with no authentication and no user interaction, which is the most dangerous profile. Patch this on priority and confirm the fix holds.

  • 0
    Remediation · TruePositive EditorialCurated

    Required action for Adminer Adminer: 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 set a federal remediation due date of 2025-10-20. After patching, verify the vulnerable path is no longer reachable before closing the finding.

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Related CVEs

Same weakness: CWE-918 · Server-Side Request Forgery (SSRF).