{"id":"CVE-2021-20729","aliases":["EUVD-2021-8143","GHSA-gmq9-rc2w-2c75"],"status":"published","title":"Cross-site scripting vulnerability in pfSense CE and pfSense Plus (pfSense CE software versions 2...","description":"Cross-site scripting vulnerability in pfSense CE and pfSense Plus (pfSense CE software versions 2.5.2 and earlier, and pfSense Plus software versions 21.05 and earlier) allows a remote attacker to inject an arbitrary script via a malicious URL.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.02878,"percentile":0.86956,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2022-03-31T07:20:29Z","modified":"2026-10-24T10:30:55Z","products":[{"vendor":"netgate","product":"pfsense_plus"},{"vendor":"pfsense","product":"pfsense"},{"vendor":"pfsense","product":"pfsense ce and pfsense plus"}],"references":[{"url":"https://docs.netgate.com/downloads/pfSense-SA-21_02.captiveportal.asc","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory"]},{"url":"https://jvn.jp/en/jp/JVN87751554/index.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","VDB Entry","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20729"},{"url":"https://github.com/advisories/GHSA-gmq9-rc2w-2c75"}],"sources":{"cve":[{"id":"CVE-2021-20729","description":"Cross-site scripting vulnerability in pfSense CE and pfSense Plus (pfSense CE software versions 2.5.2 and earlier, and pfSense Plus software versions 21.05 and earlier) allows a remote attacker to inject an arbitrary script via a malicious URL.","status":"published","published":"2022-03-31T07:20:29Z","modified":"2024-08-03T17:53:21.921Z","updated_at":"2026-11-02T14:32:55.905855Z"}],"euvd":[{"id":"EUVD-2021-8143","description":"Cross-site scripting vulnerability in pfSense CE and pfSense Plus (pfSense CE software versions 2.5.2 and earlier, and pfSense Plus software versions 21.05 and earlier) allows a remote attacker to inject an arbitrary script via a malicious URL.","status":"published","published":"2022-03-31T07:20:29Z","modified":"2024-08-03T17:53:21Z","updated_at":"2026-11-03T03:25:08.33351Z"}],"ghsa":[{"id":"GHSA-gmq9-rc2w-2c75","title":"Cross-site scripting vulnerability in pfSense CE and pfSense Plus (pfSense CE software versions 2...","description":"Cross-site scripting vulnerability in pfSense CE and pfSense Plus (pfSense CE software versions 2.5.2 and earlier, and pfSense Plus software versions 21.05 and earlier) allows a remote attacker to inject an arbitrary script via a malicious URL.","status":"published","published":"2022-04-01T00:00:43Z","modified":"2023-01-27T05:01:20Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:41:52.138061Z"}],"nvd":[{"id":"CVE-2021-20729","description":"Cross-site scripting vulnerability in pfSense CE and pfSense Plus (pfSense CE software versions 2.5.2 and earlier, and pfSense Plus software versions 21.05 and earlier) allows a remote attacker to inject an arbitrary script via a malicious URL.","status":"published","published":"2022-03-31T08:15:08.13Z","modified":"2026-06-17T03:34:19.953Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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-79"],"updated_at":"2026-11-02T14:07:05.581807Z"}],"osv":[{"id":"CVE-2021-20729","description":"Cross-site scripting vulnerability in pfSense CE and pfSense Plus (pfSense CE software versions 2.5.2 and earlier, and pfSense Plus software versions 21.05 and earlier) allows a remote attacker to inject an arbitrary script via a malicious URL.","status":"published","published":"2022-03-31T08:15:08.13Z","modified":"2026-10-24T10:30:55.717650298Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:18.004149Z"}]}}