{"schemaVersion":3,"id":"CVE-2021-4425","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"The Defender Security plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 2.4.6. This is due to missing or incorrect nonce validation on the verify_otp_login_time() function. This makes it possible for unauthenticated attackers to verify a one time login via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.","dates":{"published":"2023-07-12T07:21:50.023Z","modified":"2026-04-08T17:30:23.719Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":4.3,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":4.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":4.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"wordfence","score":4.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00563,"percentile":0.45692,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00563},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00563,"percentile":0.45692}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00563,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00563,"percentile":0.45692}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"REF_47F7C800982A0A59","name":"Exploit Reference (wordfence.com)","source":"reference","url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/e772fbbe-33d5-46fa-a041-ab07d3f9318f?source=cve","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null},{"id":"REF_69048C05D49A13AC","name":"Exploit Reference (blog.nintechnet.com)","source":"reference","url":"https://blog.nintechnet.com/25-wordpress-plugins-vulnerable-to-csrf-attacks/","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null},{"id":"REF_51F5A0A9BC017281","name":"Exploit Reference (blog.nintechnet.com)","source":"reference","url":"https://blog.nintechnet.com/more-wordpress-plugins-and-themes-vulnerable-to-csrf-attacks/","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null},{"id":"REF_2760597B7F630D7D","name":"Exploit Reference (blog.nintechnet.com)","source":"reference","url":"https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-3/","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null},{"id":"REF_B19D0B7494615724","name":"Exploit Reference (blog.nintechnet.com)","source":"reference","url":"https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-2/","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null},{"id":"REF_72FD25F0B18AB611","name":"Exploit Reference (blog.nintechnet.com)","source":"reference","url":"https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-1/","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null},{"id":"REF_A5C03F0F05206E54","name":"Exploit Reference (blog.nintechnet.com)","source":"reference","url":"https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-5/","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null},{"id":"REF_F3299D4851338882","name":"Exploit Reference (blog.nintechnet.com)","source":"reference","url":"https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-4/","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":8,"weaknesses":[{"id":"CWE-352","name":"Cross-Site Request Forgery (CSRF)","description":"The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.","type":"weakness","status":"Stable","abstraction":"Compound","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/352.html"}],"affected":[{"vendor":"wordpress","product":"defender-security","name":"Defender Security – Malware Scanner, Login Security & Firewall","label":"defender-security","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 2.4.6 (fixed in 2.4.6.1)","noFixRecorded":false,"fixedIn":"2.4.6.1"}],"versionsText":"≤ 2.4.6 (fixed in 2.4.6.1)","eol":null,"hubHref":null},{"vendor":"wpmudev","product":"defender_security","name":"defender security","label":"defender_security","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 2.4.6","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 2.4.6","eol":null,"hubHref":"/vendor/wpmudev/defender_security"},{"vendor":"wpmudev","product":"defender security – malware scanner, login security & firewall","name":"Defender Security – Malware Scanner, Login Security & Firewall","label":"defender security – malware scanner, login security & firewall","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 2.4.6","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 2.4.6","eol":null,"hubHref":"/vendor/wpmudev/defender_security_-_malware_scanner_login_security__firewall"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/e772fbbe-33d5-46fa-a041-ab07d3f9318f?source=cve","label":"www.wordfence.com/threat-intel/vulnerabilities/id/e772fbbe-33d5-46fa-a041-ab07d3f9318f?source=cve","hostname":"www.wordfence.com","tags":["Exploit","Patch","Third Party Advisory"]},{"url":"https://blog.nintechnet.com/25-wordpress-plugins-vulnerable-to-csrf-attacks/","label":"blog.nintechnet.com/25-wordpress-plugins-vulnerable-to-csrf-attacks/","hostname":"blog.nintechnet.com","tags":["Exploit","Third Party Advisory"]},{"url":"https://blog.nintechnet.com/more-wordpress-plugins-and-themes-vulnerable-to-csrf-attacks/","label":"blog.nintechnet.com/more-wordpress-plugins-and-themes-vulnerable-to-csrf-attacks/","hostname":"blog.nintechnet.com","tags":["Exploit","Third Party Advisory"]},{"url":"https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-3/","label":"blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-3/","hostname":"blog.nintechnet.com","tags":["Exploit","Third Party Advisory"]},{"url":"https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-2/","label":"blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-2/","hostname":"blog.nintechnet.com","tags":["Exploit","Third Party Advisory"]},{"url":"https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-1/","label":"blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-1/","hostname":"blog.nintechnet.com","tags":["Exploit","Third Party Advisory"]},{"url":"https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-5/","label":"blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-5/","hostname":"blog.nintechnet.com","tags":["Exploit","Third Party Advisory"]},{"url":"https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-4/","label":"blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-4/","hostname":"blog.nintechnet.com","tags":["Exploit","Third Party Advisory"]},{"url":"https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2473684%40defender-security&new=2473684%40defender-security&sfp_email=&sfph_mail=","label":"plugins.trac.wordpress.org/changeset","hostname":"plugins.trac.wordpress.org","tags":["Patch","Product"]},{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/e772fbbe-33d5-46fa-a041-ab07d3f9318f","label":"www.wordfence.com/threat-intel/vulnerabilities/id/e772fbbe-33d5-46fa-a041-ab07d3f9318f","hostname":"www.wordfence.com","tags":["Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2023-07-12T07:21:50.023Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-08T17:30:23.719Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":27,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T04:07:26.204Z","stale":false,"partial":false}}