{"id":"CVE-2021-21374","state":"PUBLISHED","title":"Nimble fails to validate certificates due to insecure httpClient defaults","description":"Nimble is a package manager for the Nim programming language. In Nim release versions before versions 1.2.10 and 1.4.4, \"nimble refresh\" fetches a list of Nimble packages over HTTPS without full verification of the SSL/TLS certificate due to the default setting of httpClient. An attacker able to perform MitM can deliver a modified package list containing malicious software packages. If the packages are installed and used the attack escalates to untrusted code execution.","publishedAt":"2021-03-26T21:25:14.000Z","updatedAt":"2024-08-03T18:09:15.923Z","severity":{"score":8.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["nim-lang security"],"affected":[{"vendor":"nim-lang","product":"security","versions":[{"version":"< 1.2.10","status":"affected"},{"version":">= 1.4.0, < 1.4.4","status":"affected"}]}],"references":["https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/","https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130","https://github.com/nim-lang/security/security/advisories/GHSA-c2wm-v66h-xhxx","https://github.com/nim-lang/Nim/pull/16940"],"weaknesses":["CWE-348","CWE-599","CWE-349"],"ingestedAt":"2026-10-29T19:47:59.168Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/21xxx/CVE-2021-21374.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-21374","state":"PUBLISHED","datePublished":"2021-03-26T21:25:14.000Z","dateUpdated":"2024-08-03T18:09:15.923Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2020-12-22T00:00:00.000Z"},"containers":{"cna":{"title":"Nimble fails to validate certificates due to insecure httpClient defaults","descriptions":[{"lang":"en","value":"Nimble is a package manager for the Nim programming language. 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