{"id":"CVE-2021-29624","aliases":["EUVD-2021-1177","GHSA-rc4q-9m69-gqp8"],"status":"published","title":"Lack of protection against cookie tossing attacks in fastify-csrf","description":"fastify-csrf is an open-source plugin helps developers protect their Fastify server against CSRF attacks. Versions of fastify-csrf prior to 3.1.0 have a \"double submit\" mechanism using cookies with an application deployed across multiple subdomains, e.g. \"heroku\"-style platform as a service. Version 3.1.0 of the fastify-csrf fixes it. the vulnerability. The user of the module would need to supply a `userInfo` when generating the CSRF token to fully implement the protection on their end. This is needed only for applications hosted on different subdomains.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00829,"percentile":0.57797,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-352","CWE-565"],"published":"2021-05-17T20:53:30Z","modified":"2026-10-20T10:54:38Z","fixes":[{"ecosystem":"npm","package":"fastify-csrf","fixed_in":["3.1.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"fastify-csrf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.0"}]}]},{"source":"osv","ecosystem":"npm","package":"fastify-csrf","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.1.0"}]}]}],"products":[{"vendor":"fastify","product":"fastify-csrf"}],"references":[{"url":"https://github.com/fastify/fastify-csrf/security/advisories/GHSA-rc4q-9m69-gqp8","tags":["x_refsource_CONFIRM","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://github.com/fastify/csrf/pull/2","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://github.com/fastify/fastify-csrf/pull/51","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://github.com/fastify/fastify-csrf/releases/tag/v3.1.0","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://owasp.org/www-pdf-archive/David_Johansson-Double_Defeat_of_Double-Submit_Cookie.pdf","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29624","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-rc4q-9m69-gqp8"}],"sources":{"cve":[{"id":"CVE-2021-29624","title":"Lack of protection against cookie tossing attacks in fastify-csrf","description":"fastify-csrf is an open-source plugin helps developers protect their Fastify server against CSRF attacks. Versions of fastify-csrf prior to 3.1.0 have a \"double submit\" mechanism using cookies with an application deployed across multiple subdomains, e.g. \"heroku\"-style platform as a service. Version 3.1.0 of the fastify-csrf fixes it. the vulnerability. The user of the module would need to supply a `userInfo` when generating the CSRF token to fully implement the protection on their end. This is needed only for applications hosted on different subdomains.","status":"published","published":"2021-05-19T21:15:28Z","modified":"2024-08-03T22:11:06.35Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-565"],"updated_at":"2026-11-02T14:33:06.32268Z"}],"euvd":[{"id":"EUVD-2021-1177","description":"fastify-csrf is an open-source plugin helps developers protect their Fastify server against CSRF attacks. Versions of fastify-csrf prior to 3.1.0 have a \"double submit\" mechanism using cookies with an application deployed across multiple subdomains, e.g. \"heroku\"-style platform as a service. Version 3.1.0 of the fastify-csrf fixes it. the vulnerability. The user of the module would need to supply a `userInfo` when generating the CSRF token to fully implement the protection on their end. This is needed only for applications hosted on different subdomains.","status":"published","published":"2021-05-19T21:15:28Z","modified":"2024-08-03T22:11:06Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","level":"medium"}],"updated_at":"2026-11-03T03:24:43.965438Z"}],"ghsa":[{"id":"GHSA-rc4q-9m69-gqp8","title":"Lack of protection against cookie tossing attacks in fastify-csrf","description":"### Impact\n\nUsers that used fastify-csrf with the \"double submit\" mechanism using cookies with an application deployed across multiple subdomains, e.g. \"heroku\"-style platform as a service. \n\n### Patches\n\nVersion 3.1.0 of the fastify-csrf fixes it. \nSee https://github.com/fastify/fastify-csrf/pull/51 and https://github.com/fastify/csrf/pull/2.\n\nThe user of the module would need to supply a `userInfo` when generating the CSRF token to fully implement the protection on their end. This is needed only for applications hosted on different subdomains.\n\n### Workarounds\n\nNone available.\n\n### References\n\n1. https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html\n2. https://owasp.org/www-pdf-archive/David_Johansson-Double_Defeat_of_Double-Submit_Cookie.pdf\n\n### Credits\n\nThis vulnerability was found by Xhelal Likaj \u003cxhelallikaj20@gmail.com\u003e.\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [fastify-csrf](https://github.com/fastify/fastify-csrf)\n* Email us at [hello@matteocollina.com](mailto:hello@matteocollina.com)\n","status":"published","published":"2021-05-17T20:53:30Z","modified":"2023-01-28T05:02:36Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","level":"medium"}],"cwes":["CWE-352","CWE-565"],"updated_at":"2026-11-02T14:36:23.433782Z"}],"nvd":[{"id":"CVE-2021-29624","description":"fastify-csrf is an open-source plugin helps developers protect their Fastify server against CSRF attacks. Versions of fastify-csrf prior to 3.1.0 have a \"double submit\" mechanism using cookies with an application deployed across multiple subdomains, e.g. \"heroku\"-style platform as a service. Version 3.1.0 of the fastify-csrf fixes it. the vulnerability. The user of the module would need to supply a `userInfo` when generating the CSRF token to fully implement the protection on their end. This is needed only for applications hosted on different subdomains.","status":"published","published":"2021-05-19T22:15:07.837Z","modified":"2026-06-17T03:48:02.987Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-565","CWE-352"],"updated_at":"2026-11-02T14:06:53.987491Z"}],"osv":[{"id":"CVE-2021-29624","description":"fastify-csrf is an open-source plugin helps developers protect their Fastify server against CSRF attacks. Versions of fastify-csrf prior to 3.1.0 have a \"double submit\" mechanism using cookies with an application deployed across multiple subdomains, e.g. \"heroku\"-style platform as a service. Version 3.1.0 of the fastify-csrf fixes it. the vulnerability. The user of the module would need to supply a `userInfo` when generating the CSRF token to fully implement the protection on their end. This is needed only for applications hosted on different subdomains.","status":"published","published":"2021-05-19T22:15:07.837Z","modified":"2026-10-20T10:54:38.921910426Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:19.483607Z"},{"id":"GHSA-rc4q-9m69-gqp8","title":"Lack of protection against cookie tossing attacks in fastify-csrf","description":"### Impact\n\nUsers that used fastify-csrf with the \"double submit\" mechanism using cookies with an application deployed across multiple subdomains, e.g. \"heroku\"-style platform as a service. \n\n### Patches\n\nVersion 3.1.0 of the fastify-csrf fixes it. \nSee https://github.com/fastify/fastify-csrf/pull/51 and https://github.com/fastify/csrf/pull/2.\n\nThe user of the module would need to supply a `userInfo` when generating the CSRF token to fully implement the protection on their end. This is needed only for applications hosted on different subdomains.\n\n### Workarounds\n\nNone available.\n\n### References\n\n1. https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html\n2. https://owasp.org/www-pdf-archive/David_Johansson-Double_Defeat_of_Double-Submit_Cookie.pdf\n\n### Credits\n\nThis vulnerability was found by Xhelal Likaj \u003cxhelallikaj20@gmail.com\u003e.\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [fastify-csrf](https://github.com/fastify/fastify-csrf)\n* Email us at [hello@matteocollina.com](mailto:hello@matteocollina.com)\n","status":"published","published":"2021-05-17T20:53:30Z","modified":"2026-07-08T06:28:40.068593532Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","level":"medium"}],"cwes":["CWE-352","CWE-565"],"updated_at":"2026-11-02T15:46:55.877614Z"}]}}