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How to verify CVE-2021-39201

Confirm whether your systems are actually affected — run the exact detection check below (Nuclei command or OpenVAS NVT). Detection only; it does not exploit.

How to verify this vulnerability

Scanner data tells you how to confirm whether your systems are actually affected — not just that the CVE exists. Run a Nuclei template against your target for a yes/no answer in seconds.

What's a Nuclei template? Nuclei is a free, open-source scanner. A template is a small YAML rule that probes a target and reports whether it's vulnerable. Runs locally, no agent.
1 · AUTOMATEDDetection command
nuclei -t CVE-2021-39201.yaml -u https://your-target -rl 50 -timeout 10

Community template — download the YAML from GitHub first, then run the command against your own host.

2 Nuclei templates
  • highCommunityhttpWordPress Core 5.4 - 5.8 - Authenticated Stored Cross-Site ScriptingGitHub ↗
  • lowCommunityhttpWordPress Core 5.4 - 5.8 - Authenticated Stored Cross-Site Scripting GitHub ↗

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This template is on GitHub already — an account lets you search and filter every CVE that has one, not just this CVE.

Nuclei References

Verify with OpenVAS

Greenbone/OpenVAS ships 4 NVT checks for CVE-2021-39201. OpenVAS detects this CVE by NVT OID — enable the NVT in your scan config, or confirm it is in your feed with the query below.

Confirm the NVT is in your feed (GMP)
gvm-cli socket --xml "<get_nvts nvt_oid='1.3.6.1.4.1.25623.1.0.146689' details='1'/>"
NVT OIDs (4)
  • 1.3.6.1.4.1.25623.1.0.146689since 2026-06-25
  • 1.3.6.1.4.1.25623.1.0.146690since 2026-06-25
  • 1.3.6.1.4.1.25623.1.0.704985since 2026-06-25
  • 1.3.6.1.4.1.25623.1.1.1.1.2021.4985since 2026-06-25
New to OpenVAS? Greenbone documentation ↗
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