{"id":"CVE-2021-21424","aliases":["BIT-symfony-2021-21424","DEBIAN-CVE-2021-21424","DLA-3493-1","EUVD-2021-0960","GHSA-5pv8-ppvj-4h68","UBUNTU-CVE-2021-21424","USN-5290-1"],"status":"published","title":"Prevent user enumeration using Guard or the new Authenticator-based Security","description":"Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch users functionality. We now ensure that 403s are returned whether the user exists or not if a user cannot switch to a user or if the user does not exist. The patch for this issue is available for branch 3.4.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.01644,"percentile":0.76786,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-200","CWE-203"],"published":"2021-05-13T00:00:00Z","modified":"2026-10-24T10:47:52Z","exploits":[{"source":"pocgithub","id":"moften/CVE-2021-21424","title":"moften/CVE-2021-21424","date":"2025-04-14","url":"https://github.com/moften/CVE-2021-21424"},{"source":"pocgithub","id":"moften/Symfony-CVE-Scanner-PoC-","title":"moften/Symfony-CVE-Scanner-PoC-","date":"2025-05-07","url":"https://github.com/moften/Symfony-CVE-Scanner-PoC-"}],"fixes":[{"ecosystem":"Packagist","package":"symfony/security","fixed_in":["5.2.8","3.4.49","4.4.24"],"sources":["ghsa","osv"]},{"ecosystem":"Packagist","package":"symfony/security-guard","fixed_in":["3.4.48","4.4.23","5.2.8"],"sources":["ghsa","osv"]},{"ecosystem":"Packagist","package":"symfony/security-core","fixed_in":["3.4.48","4.4.23","5.2.8"],"sources":["ghsa","osv"]},{"ecosystem":"Packagist","package":"lexik/jwt-authentication-bundle","fixed_in":["2.10.7","2.11.3"],"sources":["ghsa","osv"]},{"ecosystem":"Packagist","package":"symfony/maker-bundle","fixed_in":["1.29.2","1.31.1"],"sources":["ghsa","osv"]},{"ecosystem":"Packagist","package":"symfony/security-http","fixed_in":["5.2.8"],"sources":["ghsa","osv"]},{"ecosystem":"Packagist","package":"symfony/symfony","fixed_in":["3.4.49","4.4.24","5.2.9"],"sources":["ghsa","osv"]},{"ecosystem":"Bitnami","package":"symfony","fixed_in":["3.4.48","4.4.23","5.2.8"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"symfony","fixed_in":["4.4.19+dfsg-2"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"symfony","fixed_in":["4.4.19+dfsg-2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"symfony","fixed_in":["4.4.19+dfsg-2"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:18.04:LTS","package":"symfony","fixed_in":["3.4.6+dfsg-1ubuntu0.1+esm2"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:20.04:LTS","package":"symfony","fixed_in":["4.3.8+dfsg-1ubuntu1+esm1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"symfony/security","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.0.0"},{"fixed":"5.2.8"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/security-guard","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.8.0"},{"fixed":"3.4.48"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/security-guard","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.4.23"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/security-guard","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.0.0"},{"fixed":"5.2.8"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/security-core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.8.0"},{"fixed":"3.4.48"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/security-core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.4.23"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/security-core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.0.0"},{"fixed":"5.2.8"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"lexik/jwt-authentication-bundle","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.0.0"},{"fixed":"2.10.7"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"lexik/jwt-authentication-bundle","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.11.0"},{"fixed":"2.11.3"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/maker-bundle","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.27.0"},{"fixed":"1.29.2"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/maker-bundle","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.30.0"},{"fixed":"1.31.1"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/security-http","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.1.0"},{"fixed":"5.2.8"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/security","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.8.0"},{"fixed":"3.4.49"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/security","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.4.24"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/symfony","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.8.0"},{"fixed":"3.4.49"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/symfony","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.4.24"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"symfony/symfony","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.0.0"},{"fixed":"5.2.9"}]}]},{"source":"osv","ecosystem":"Bitna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Advisory","web","fix","report"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KENRNLB3FYXYGDWRBH2PDBOZZKOD7VY4/","tags":["vendor-advisory","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VRUS2H2SSOQWNLBD35SKIWIDQEMV2PD3/","tags":["vendor-advisory","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UC7BND775DVZDQT3RMGD2HVB2PKLJDJW/","tags":["vendor-advisory","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RH7TMM5CHQYBFFGXWRPJDPB3SKCZXI2M/","tags":["vendor-advisory","x_transferred","web"]},{"url":"https://lists.debian.org/debian-lts-announce/2023/07/msg00014.html","tags":["mailing-list","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21424","tags":["advisory"]},{"url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/lexik/jwt-authentication-bundle/CVE-2021-21424.yaml","tags":["web"]},{"url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/maker-bundle/CVE-2021-21424.yaml","tags":["web"]},{"url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-guard/CVE-2021-21424.yaml","tags":["web"]},{"url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-http/CVE-2021-21424.yaml","tags":["web"]},{"url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security/CVE-2021-21424.yaml","tags":["web"]},{"url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2021-21424.yaml","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KENRNLB3FYXYGDWRBH2PDBOZZKOD7VY4","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RH7TMM5CHQYBFFGXWRPJDPB3SKCZXI2M","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UC7BND775DVZDQT3RMGD2HVB2PKLJDJW","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VRUS2H2SSOQWNLBD35SKIWIDQEMV2PD3","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KENRNLB3FYXYGDWRBH2PDBOZZKOD7VY4","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RH7TMM5CHQYBFFGXWRPJDPB3SKCZXI2M","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UC7BND775DVZDQT3RMGD2HVB2PKLJDJW","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VRUS2H2SSOQWNLBD35SKIWIDQEMV2PD3","tags":["web"]},{"url":"https://symfony.com/cve-2021-21424","tags":["web"]},{"url":"https://github.com/advisories/GHSA-5pv8-ppvj-4h68"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-21424","tags":["advisory"]},{"url":"https://github.com/symfony/symfony","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2021-21424","tags":["report"]},{"url":"https://symfony.com/blog/cve-2021-21424-prevent-user-enumeration-in-authentication-mechanisms","tags":["report"]},{"url":"https://github.com/symfony/symfony/commit/f012eee6c6034a94566dff596fe4e16dfc5d9c1f","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-5290-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-21424","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-41270","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-21424","title":"Prevent user enumeration using Guard or the new Authenticator-based Security","description":"Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch users functionality. We now ensure that 403s are returned whether the user exists or not if a user cannot switch to a user or if the user does not exist. The patch for this issue is available for branch 3.4.","status":"published","published":"2021-05-13T00:00:00Z","modified":"2024-08-03T18:09:16.141Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:32:59.802172Z"}],"euvd":[{"id":"EUVD-2021-0960","description":"Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch users functionality. We now ensure that 403s are returned whether the user exists or not if a user cannot switch to a user or if the user does not exist. The patch for this issue is available for branch 3.4.","status":"published","published":"2021-05-13T00:00:00Z","modified":"2024-08-03T18:09:16Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-03T03:25:06.347262Z"}],"ghsa":[{"id":"GHSA-5pv8-ppvj-4h68","title":"Prevent user enumeration using Guard or the new Authenticator-based Security","description":"Description\n-----------\n\nThe ability to enumerate users was possible without relevant permissions due to different exception messages depending on whether the user existed or not. It was also possible to enumerate users by using a timing attack, by comparing time elapsed when authenticating an existing user and authenticating a non-existing user.\n\nResolution\n----------\n\nWe now ensure that 403s are returned whether the user exists or not if the password is invalid or if the user does not exist.\n\nThe patch for this issue is available [here](https://github.com/symfony/symfony/commit/2a581d22cc621b33d5464ed65c4bc2057f72f011) for branch 3.4.\n\nCredits\n-------\n\nI would like to thank James Isaac and Mathias Brodala for reporting the issue and Robin Chalas for fixing the issue.","status":"published","published":"2021-05-13T20:23:02Z","modified":"2024-02-26T12:40:00Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-200","CWE-203"],"updated_at":"2026-11-02T14:37:38.935144Z"}],"nvd":[{"id":"CVE-2021-21424","description":"Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch users functionality. We now ensure that 403s are returned whether the user exists or not if a user cannot switch to a user or if the user does not exist. The patch for this issue is available for branch 3.4.","status":"published","published":"2021-05-13T16:15:07.777Z","modified":"2026-06-17T03:35:32.947Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-200","CWE-203"],"updated_at":"2026-11-02T14:06:53.343329Z"}],"osv":[{"id":"CVE-2021-21424","description":"Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch users functionality. We now ensure that 403s are returned whether the user exists or not if a user cannot switch to a user or if the user does not exist. The patch for this issue is available for branch 3.4.","status":"published","published":"2021-05-13T16:15:07.777Z","modified":"2026-10-24T10:47:52.914734024Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:18.004149Z"},{"id":"DEBIAN-CVE-2021-21424","description":"Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch users functionality. We now ensure that 403s are returned whether the user exists or not if a user cannot switch to a user or if the user does not exist. The patch for this issue is available for branch 3.4.","status":"published","published":"2021-05-13T16:15:07.777Z","modified":"2026-10-23T18:03:24.996776708Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:34.637046Z"},{"id":"GHSA-5pv8-ppvj-4h68","title":"Prevent user enumeration using Guard or the new Authenticator-based Security","description":"Description\n-----------\n\nThe ability to enumerate users was possible without relevant permissions due to different exception messages depending on whether the user existed or not. It was also possible to enumerate users by using a timing attack, by comparing time elapsed when authenticating an existing user and authenticating a non-existing user.\n\nResolution\n----------\n\nWe now ensure that 403s are returned whether the user exists or not if the password is invalid or if the user does not exist.\n\nThe patch for this issue is available [here](https://github.com/symfony/symfony/commit/2a581d22cc621b33d5464ed65c4bc2057f72f011) for branch 3.4.\n\nCredits\n-------\n\nI would like to thank James Isaac and Mathias Brodala for reporting the issue and Robin Chalas for fixing the issue.","status":"published","published":"2021-05-13T20:23:02Z","modified":"2026-09-10T03:49:04.87111781Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-200","CWE-203"],"updated_at":"2026-11-02T15:46:38.553953Z"},{"id":"UBUNTU-CVE-2021-21424","description":"Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch users functionality. We now ensure that 403s are returned whether the user exists or not if a user cannot switch to a user or if the user does not exist. The patch for this issue is available for branch 3.4.","status":"published","published":"2021-05-13T16:15:00Z","modified":"2026-02-04T02:49:48.090547Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:54:26.29421Z"},{"id":"BIT-symfony-2021-21424","description":"Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch users functionality. We now ensure that 403s are returned whether the user exists or not if a user cannot switch to a user or if the user does not exist. The patch for this issue is available for branch 3.4.","status":"published","published":"2024-03-06T11:08:14.584Z","modified":"2024-03-06T11:25:28.861Z","updated_at":"2026-11-02T15:28:35.51001Z"},{"id":"DLA-3493-1","title":"symfony - security update","status":"published","published":"2023-07-11T00:00:00Z","modified":"2026-03-09T01:20:03.769307Z","updated_at":"2026-11-02T15:46:11.734021Z"},{"id":"USN-5290-1","title":"symfony vulnerabilities","description":"James Isaac and Mathias Brodala discovered that Symfony incorrectly handled\nswitch users functionality. An attacker could possibly use this issue to\nenumerate users. (CVE-2021-21424)\n\nIt was discovered that Symfony incorrectly handled certain specially crafted\nCSV files. An attacker could possibly use this issue to execute arbitrary\ncode. This issue only affected Ubuntu 20.04 ESM. (CVE-2021-41270)\n","status":"published","published":"2022-08-24T11:38:04Z","modified":"2026-02-10T04:42:29Z","updated_at":"2026-11-02T16:58:15.683829Z"}]}}