{"id":"CVE-2021-42237","aliases":["EUVD-2021-29215","GHSA-j3x5-fr4h-9v7v"],"status":"published","title":"Sitecore XP 7.5 Initial Release to Sitecore XP 8.2 Update-7 is vulnerable to an insecure...","description":"Sitecore XP 7.5 Initial Release to Sitecore XP 8.2 Update-7 is vulnerable to an insecure deserialization attack where it is possible to achieve remote command execution on the machine. No authentication or special configuration is required to exploit this vulnerability.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.97399,"percentile":0.99899,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":true,"fix_available":false},"cwes":["CWE-502"],"published":"2021-11-05T09:51:18Z","modified":"2026-07-09T13:57:14Z","kev":{"date_added":"2022-03-25","due_date":"2022-04-15","required_action":"Apply updates per vendor instructions.","known_ransomware_use":"Known"},"exploitation":[{"source":"euvd","since":"2022-03-25"},{"source":"kev","since":"2022-03-25"}],"exploits":[{"source":"metasploit","id":"exploit/windows/http/sitecore_xp_cve_2021_42237","title":"Sitecore Experience Platform (XP) PreAuth Deserialization RCE","type":"exploit","platform":"Windows","date":"2021-11-02","verified":true,"url":"https://www.rapid7.com/db/modules/exploit/windows/http/sitecore_xp_cve_2021_42237"},{"source":"pocgithub","id":"ItsIgnacioPortal/CVE-2021-42237","title":"ItsIgnacioPortal/CVE-2021-42237","date":"2022-01-16","url":"https://github.com/ItsIgnacioPortal/CVE-2021-42237"},{"source":"pocgithub","id":"vesperp/CVE-2021-42237-SiteCore-XP","title":"vesperp/CVE-2021-42237-SiteCore-XP","date":"2022-06-30","url":"https://github.com/vesperp/CVE-2021-42237-SiteCore-XP"},{"source":"pocgithub","id":"crankyyash/SiteCore-RCE-Detection","title":"crankyyash/SiteCore-RCE-Detection","date":"2022-09-22","url":"https://github.com/crankyyash/SiteCore-RCE-Detection"},{"source":"nuclei","id":"CVE-2021-42237","title":"Sitecore Experience Platform Pre-Auth RCE","type":"detection template","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-42237.yaml"}],"products":[{"vendor":"sitecore","product":"experience_platform"},{"vendor":"sitecore","product":"xp"}],"references":[{"url":"https://support.sitecore.com/kb?id=kb_article_view\u0026sysparm_article=KB1000776","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://blog.assetnote.io/2021/11/02/sitecore-rce/","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"http://packetstormsecurity.com/files/164988/Sitecore-Experience-Platform-XP-Remote-Code-Execution.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","VDB Entry"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42237","tags":["government-resource","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-42237"},{"url":"http://sitecore.com"},{"url":"https://blog.assetnote.io/2021/11/02/sitecore-rce"},{"url":"https://github.com/advisories/GHSA-j3x5-fr4h-9v7v"}],"sources":{"cve":[{"id":"CVE-2021-42237","description":"Sitecore XP 7.5 Initial Release to Sitecore XP 8.2 Update-7 is vulnerable to an insecure deserialization attack where it is possible to achieve remote command execution on the machine. 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