How to verify CVE-2021-39191

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 12 NVT checks for CVE-2021-39191. 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='1.3.6.1.4.1.25623.1.0.819453' details='1'/>"

NVT OIDs (12)

1.3.6.1.4.1.25623.1.0.819453since 2026-06-25
1.3.6.1.4.1.25623.1.0.820561since 2026-06-25
1.3.6.1.4.1.25623.1.1.11.2022.1823since 2026-06-25
1.3.6.1.4.1.25623.1.1.1.2.2023.3499since 2026-06-25
1.3.6.1.4.1.25623.1.1.14.2022.1823since 2026-06-25
1.3.6.1.4.1.25623.1.1.15.2022.1823since 2026-06-25
1.3.6.1.4.1.25623.1.1.18.2.2025.4532.1since 2026-06-25
1.3.6.1.4.1.25623.1.1.4.2021.3352.1since 2026-06-25
1.3.6.1.4.1.25623.1.1.4.2023.0215.1since 2026-06-25
1.3.6.1.4.1.25623.1.1.4.2025.4532.1since 2026-06-25

+ 2 more NVTs

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