How to verify CVE-2021-20288

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 17 NVT checks for CVE-2021-20288. 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='1.3.6.1.4.1.25623.1.0.844993' details='1'/>"

NVT OIDs (17)

1.3.6.1.4.1.25623.1.0.844993since 2026-06-25
1.3.6.1.4.1.25623.1.0.845119since 2026-06-25
1.3.6.1.4.1.25623.1.0.853797since 2026-06-25
1.3.6.1.4.1.25623.1.0.879493since 2026-06-25
1.3.6.1.4.1.25623.1.0.879497since 2026-06-25
1.3.6.1.4.1.25623.1.0.879503since 2026-06-25
1.3.6.1.4.1.25623.1.1.10.2021.0207since 2026-06-25
1.3.6.1.4.1.25623.1.1.12.2021.4998.1since 2026-06-25
1.3.6.1.4.1.25623.1.1.12.2021.5128.1since 2026-06-25
1.3.6.1.4.1.25623.1.1.1.2.2023.3629since 2026-06-25

+ 7 more NVTs

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