{"id":"CVE-2021-29441","state":"PUBLISHED","title":"Authentication bypass","description":"Nacos is a platform designed for dynamic service discovery and configuration and service management. In Nacos before version 1.4.1, when configured to use authentication (-Dnacos.core.auth.enabled=true) Nacos uses the AuthFilter servlet filter to enforce authentication. This filter has a backdoor that enables Nacos servers to bypass this filter and therefore skip authentication checks. This mechanism relies on the user-agent HTTP header so it can be easily spoofed. This issue may allow any user to carry out any administrative tasks on the Nacos server.","publishedAt":"2021-04-27T20:20:20.000Z","updatedAt":"2024-08-03T22:02:51.975Z","severity":{"score":8.6,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["alibaba nacos"],"affected":[{"vendor":"alibaba","product":"nacos","versions":[{"version":"< 1.4.1","status":"affected"}]}],"references":["https://github.com/alibaba/nacos/issues/4701","https://github.com/advisories/GHSA-36hp-jr8h-556f","https://github.com/alibaba/nacos/pull/4703"],"weaknesses":["CWE-290"],"ingestedAt":"2026-10-29T19:48:21.578Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/29xxx/CVE-2021-29441.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-29441","state":"PUBLISHED","datePublished":"2021-04-27T20:20:20.000Z","dateUpdated":"2024-08-03T22:02:51.975Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2021-03-30T00:00:00.000Z"},"containers":{"cna":{"title":"Authentication bypass","descriptions":[{"lang":"en","value":"Nacos is a platform designed for dynamic service discovery and configuration and service management. In Nacos before version 1.4.1, when configured to use authentication (-Dnacos.core.auth.enabled=true) Nacos uses the AuthFilter servlet filter to enforce authentication. This filter has a backdoor that enables Nacos servers to bypass this filter and therefore skip authentication checks. This mechanism relies on the user-agent HTTP header so it can be easily spoofed. This issue may allow any user to carry out any administrative tasks on the Nacos server."}],"affected":[{"vendor":"alibaba","product":"nacos","versions":[{"version":"< 1.4.1","status":"affected"}]}],"references":[{"url":"https://github.com/alibaba/nacos/issues/4701","tags":["x_refsource_MISC"]},{"url":"https://github.com/advisories/GHSA-36hp-jr8h-556f","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/alibaba/nacos/pull/4703","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.6,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-290","description":"CWE-290 Authentication Bypass by Spoofing","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","dateUpdated":"2021-04-27T20:20:20.000Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa"},"source":{"advisory":"GHSA-36hp-jr8h-556f","discovery":"UNKNOWN"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"security-advisories@github.com","ID":"CVE-2021-29441","STATE":"PUBLIC","TITLE":"Authentication bypass"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"nacos","version":{"version_data":[{"version_value":"< 1.4.1"}]}}]},"vendor_name":"alibaba"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Nacos is a platform designed for dynamic service discovery and configuration and service management. In Nacos before version 1.4.1, when configured to use authentication (-Dnacos.core.auth.enabled=true) Nacos uses the AuthFilter servlet filter to enforce authentication. This filter has a backdoor that enables Nacos servers to bypass this filter and therefore skip authentication checks. This mechanism relies on the user-agent HTTP header so it can be easily spoofed. 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