How to verify CVE-2021-21284

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

Verify with OpenVAS

Greenbone/OpenVAS ships 23 NVT checks for CVE-2021-21284. 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='1.3.6.1.4.1.25623.1.0.145328' details='1'/>"

NVT OIDs (23)

1.3.6.1.4.1.25623.1.0.145328since 2026-06-25
1.3.6.1.4.1.25623.1.0.704865since 2026-06-25
1.3.6.1.4.1.25623.1.0.853705since 2026-06-25
1.3.6.1.4.1.25623.1.0.853864since 2026-06-25
1.3.6.1.4.1.25623.1.0.853953since 2026-06-25
1.3.6.1.4.1.25623.1.1.1.1.2021.4865since 2026-06-25
1.3.6.1.4.1.25623.1.1.16.2021.1102since 2026-06-25
1.3.6.1.4.1.25623.1.1.18.1.2024.10722.1since 2026-06-25
1.3.6.1.4.1.25623.1.1.18.1.2025.15589.1since 2026-06-25
1.3.6.1.4.1.25623.1.1.18.1.2025.16651.1since 2026-06-25

+ 13 more NVTs

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