{"id":"CVE-2021-42279","aliases":["EUVD-2022-4364","GHSA-jgrp-6qqq-3284"],"status":"published","title":"Chakra Scripting Engine Memory Corruption Vulnerability","description":"Chakra Scripting Engine Memory Corruption Vulnerability","severity":{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.02319,"percentile":0.8359,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2021-11-10T00:47:07Z","modified":"2026-08-19T17:17:59Z","affected":[{"source":"ghsa","ecosystem":"NuGet","package":"Microsoft.ChakraCore","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.11.24"}]}]},{"source":"osv","ecosystem":"NuGet","package":"Microsoft.ChakraCore","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.11.24"}]}],"versions":["1.10.0","1.10.1","1.10.2","1.11.0","1.11.1","1.11.10","1.11.11","1.11.12","1.11.13","1.11.14","1.11.15","1.11.16","1.11.17","1.11.18","1.11.19","1.11.2","1.11.20","1.11.21","1.11.22","1.11.23","1.11.24","1.11.3","1.11.4","1.11.5","1.11.6","1.11.7","1.11.8","1.11.9","1.2.0","1.2.1","1.2.2","1.2.3","1.2.6.62716-preview","1.3.0","1.3.1","1.3.2","1.4.0","1.4.1","1.4.2","1.4.3","1.4.4","1.4.5","1.5.0","1.5.1","1.5.2","1.5.3","1.6.0","1.6.2","1.7.0","1.7.1","1.7.2","1.7.3","1.7.4","1.7.5","1.7.6","1.8.0","1.8.1","1.8.2","1.8.3","1.8.4","1.8.5"]}],"products":[{"vendor":"microsoft","product":"chakracore"},{"vendor":"microsoft","product":"windows 10 version 1507"},{"vendor":"microsoft","product":"windows 10 version 1607"},{"vendor":"microsoft","product":"windows 10 version 1809"},{"vendor":"microsoft","product":"windows 10 version 1909"},{"vendor":"microsoft","product":"windows 10 version 2004"},{"vendor":"microsoft","product":"windows 10 version 20h2"},{"vendor":"microsoft","product":"windows 10 version 21h1"},{"vendor":"microsoft","product":"windows 11 version 21h2"},{"vendor":"microsoft","product":"windows server 2016"},{"vendor":"microsoft","product":"windows server 2019"},{"vendor":"microsoft","product":"windows server 2022"},{"vendor":"microsoft","product":"windows server version 2004"},{"vendor":"microsoft","product":"windows server version 20h2"},{"vendor":"microsoft","product":"windows_10"},{"vendor":"microsoft","product":"windows_11"},{"vendor":"microsoft","product":"windows_server_2016"},{"vendor":"microsoft","product":"windows_server_2019"},{"vendor":"microsoft","product":"windows_server_2022"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42279","tags":["vendor-advisory","patch"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42279","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-42279","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-jgrp-6qqq-3284"}],"sources":{"cve":[{"id":"CVE-2021-42279","title":"Chakra Scripting Engine Memory Corruption Vulnerability","description":"Chakra Scripting Engine Memory Corruption Vulnerability","status":"published","published":"2021-11-10T00:47:07Z","modified":"2026-08-19T16:27:00.942Z","cvss":[{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:32:58.359368Z"}],"euvd":[{"id":"EUVD-2022-4364","description":"Chakra Scripting Engine Memory Corruption Vulnerability","status":"published","published":"2021-11-10T00:47:07Z","modified":"2026-08-19T16:27:00Z","cvss":[{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-02T18:01:43.792814Z"}],"ghsa":[{"id":"GHSA-jgrp-6qqq-3284","title":"Chakra Scripting Engine and ChakraCore Vulnerable to Memory Corruption","description":"Chakra Scripting Engine and ChakraCore are vulnerable to memory corruption due to an out-of-bounds write. The Microsoft advisory for CVE-2021-42279 was modified in August 2022 to include Microsoft.ChakraCore as an affected product.","status":"published","published":"2022-05-24T19:20:22Z","modified":"2023-01-28T05:01:49Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:36:23.433782Z"}],"nvd":[{"id":"CVE-2021-42279","description":"Chakra Scripting Engine Memory Corruption Vulnerability","status":"published","published":"2021-11-10T01:19:44.56Z","modified":"2026-08-19T17:17:59.02Z","cvss":[{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":5.1,"vector":"AV:N/AC:H/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:07:00.984108Z"}],"osv":[{"id":"GHSA-jgrp-6qqq-3284","title":"Chakra Scripting Engine and ChakraCore Vulnerable to Memory Corruption","description":"Chakra Scripting Engine and ChakraCore are vulnerable to memory corruption due to an out-of-bounds write. The Microsoft advisory for CVE-2021-42279 was modified in August 2022 to include Microsoft.ChakraCore as an affected product.","status":"published","published":"2022-05-24T19:20:22Z","modified":"2023-11-08T04:07:05.468205Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:46:50.336262Z"}]}}
