CVE-2021-42237

CVE-2021-42237 is a critical-severity (CVSS 9.8) vulnerability in Sitecore XP. CISA added it to the Known Exploited Vulnerabilities catalog on March 25, 2022, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by April 15, 2022. CISA also lists it as known to be used in ransomware campaigns, so it should be prioritised accordingly. Sitecore has 4 vulnerabilities in the KEV catalog, 1 of them linked to ransomware.

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.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

• http://packetstormsecurity.com/files/164988/Sitecore-Experience-Platform-XP-Remote-Code-Execution.html
• https://blog.assetnote.io/2021/11/02/sitecore-rce/
• https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1000776
• http://packetstormsecurity.com/files/164988/Sitecore-Experience-Platform-XP-Remote-Code-Execution.html
• https://blog.assetnote.io/2021/11/02/sitecore-rce/
• https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1000776
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42237