{"id":"CVE-2021-3807","title":"ansi-regex is vulnerable to Inefficient Regular Expression Complexity","summary":"ansi-regex is vulnerable to Inefficient Regular Expression Complexity","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-1333","CWE-1333"],"vendor":"ansi-regex_project","product":"ansi-regex","affected":["ansi-regex >= 4.0.0, < 4.1.1","ansi-regex = 3.0.0","ansi-regex = 5.0.0","ansi-regex = 6.0.0","communications_cloud_native_core_policy = 1.15.0"],"patched":["ansi-regex 4.1.1"],"published":"2021-09-17","updated":"2026-10-08","sourceUpdated":"2026-10-08T22:17:11.557","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-3807","references":[{"url":"https://github.com/chalk/ansi-regex/commit/8d1d7cdb586269882c4bdc1b7325d0c58c8f76f9","label":"security@huntr.dev"},{"url":"https://huntr.dev/bounties/5b3cf33b-ede0-4398-9974-800876dfd994","label":"security@huntr.dev"},{"url":"https://security.netapp.com/advisory/ntap-20221014-0002/","label":"security@huntr.dev"},{"url":"https://www.oracle.com/security-alerts/cpuapr2022.html","label":"security@huntr.dev"},{"url":"https://github.com/chalk/ansi-regex/commit/8d1d7cdb586269882c4bdc1b7325d0c58c8f76f9","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://huntr.dev/bounties/5b3cf33b-ede0-4398-9974-800876dfd994","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20221014-0002/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpuapr2022.html","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.03552,"epssPercentile":0.88994,"ingestedAt":"2026-10-08T23:16:47.323Z","slug":"CVE-2021-3807","body":"## Overview\n\nansi-regex is vulnerable to Inefficient Regular Expression Complexity\n\n## Affected\n\n- `ansi-regex >= 4.0.0, < 4.1.1`\n- `ansi-regex = 3.0.0`\n- `ansi-regex = 5.0.0`\n- `ansi-regex = 6.0.0`\n- `communications_cloud_native_core_policy = 1.15.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `ansi-regex 4.1.1`","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":41.3,"likelihood":0.7,"exploitation":0,"ransomware":0},"changes":[]}