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GeoServer through 2.18.5 and 2.19.x through 2.19.2 allows SSRF via the option for setting a proxy host.
Use CWE-918, Osgeo vendor hub and Geoserver product page to widen CVE-2021-40822 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2025-30220, CVE-2023-25157 and CVE-2024-34711 for nearby disclosures in the same product family.