{"id":"CVE-2021-22958","aliases":["EUVD-2021-2139","GHSA-284f-f2hw-j2gx"],"status":"published","title":"Server-Side Request Forgery vulnerability in concrete5","description":"A Server-Side Request Forgery vulnerability was found in concrete5 \u003c 8.5.5 that allowed a decimal notation encoded IP address to bypass the limitations in place for localhost allowing interaction with local services. Impact can vary depending on services exposed.CVSSv2.0 AV:A/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01226,"percentile":0.69078,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-918"],"published":"2021-10-07T13:35:02Z","modified":"2026-10-24T10:30:34Z","fixes":[{"ecosystem":"Packagist","package":"concrete5/concrete5","fixed_in":["8.5.5"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"concrete5/concrete5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.5"}]}]},{"source":"osv","ecosystem":"Packagist","package":"concrete5/concrete5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.5"}]}],"versions":["8.0","8.0.1","8.0.2","8.0.3","8.1.0","8.2.0","8.2.0RC2","8.2.1","8.3.0","8.3.1","8.3.2","8.4.0","8.4.0RC3","8.4.0RC4","8.4.1","8.4.2","8.4.3","8.4.4","8.4.5","8.5.0","8.5.0RC1","8.5.0RC2","8.5.1","8.5.2","8.5.3","8.5.4"]}],"products":[{"vendor":"concretecms","product":"concrete_cms"}],"references":[{"url":"https://hackerone.com/reports/863221","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Permissions Required","Third Party Advisory","report","web"]},{"url":"https://documentation.concretecms.org/developers/introduction/version-history/855-release-notes","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-22958","tags":["advisory"]},{"url":"https://github.com/concrete5/concrete5/pull/8826","tags":["web"]},{"url":"https://github.com/advisories/GHSA-284f-f2hw-j2gx"},{"url":"https://github.com/concrete5/concrete5","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-22958","description":"A Server-Side Request Forgery vulnerability was found in concrete5 \u003c 8.5.5 that allowed a decimal notation encoded IP address to bypass the limitations in place for localhost allowing interaction with local services. 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Impact can vary depending on services exposed.CVSSv2.0 AV:A/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N","status":"published","published":"2021-10-07T13:35:02Z","modified":"2024-08-03T18:58:26Z","updated_at":"2026-11-03T03:25:00.591933Z"}],"ghsa":[{"id":"GHSA-284f-f2hw-j2gx","title":"Server-Side Request Forgery vulnerability in concrete5","description":"A Server-Side Request Forgery vulnerability was found in concrete5 \u003c 8.5.5 that allowed a decimal notation encoded IP address to bypass the limitations in place for localhost allowing interaction with local services. Impact can vary depending on services exposed.","status":"published","published":"2021-10-12T18:41:59Z","modified":"2023-02-01T05:06:22Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N","level":"high"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T14:36:38.281533Z"}],"nvd":[{"id":"CVE-2021-22958","description":"A Server-Side Request Forgery vulnerability was found in concrete5 \u003c 8.5.5 that allowed a decimal notation encoded IP address to bypass the limitations in place for localhost allowing interaction with local services. Impact can vary depending on services exposed.CVSSv2.0 AV:A/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N","status":"published","published":"2021-10-07T14:15:08.107Z","modified":"2026-06-17T03:38:06.503Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T14:06:59.314106Z"}],"osv":[{"id":"CVE-2021-22958","description":"A Server-Side Request Forgery vulnerability was found in concrete5 \u003c 8.5.5 that allowed a decimal notation encoded IP address to bypass the limitations in place for localhost allowing interaction with local services. Impact can vary depending on services exposed.CVSSv2.0 AV:A/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N","status":"published","published":"2021-10-07T14:15:08.107Z","modified":"2026-10-24T10:30:34.907169739Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:18.367807Z"},{"id":"GHSA-284f-f2hw-j2gx","title":"Server-Side Request Forgery vulnerability in concrete5","description":"A Server-Side Request Forgery vulnerability was found in concrete5 \u003c 8.5.5 that allowed a decimal notation encoded IP address to bypass the limitations in place for localhost allowing interaction with local services. Impact can vary depending on services exposed.","status":"published","published":"2021-10-12T18:41:59Z","modified":"2023-11-08T04:05:02.123536Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N","level":"high"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T15:46:33.956911Z"}]}}