Actively exploited · Published Nov 5, 2021 · Assigned by mitre
CVE-2021-42237
Critical 9.8 Exploited Ransomware
In plain English
A critical-severity unsafe deserialization in XP from Sitecore. Attackers are actively exploiting it in the wild (listed by CISA on March 25, 2022). It has been used in ransomware campaigns. The chance it is exploited in the next 30 days is estimated at 97.6% (higher than 99.9% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, Nuclei, public proof-of-concept code. Apply updates per vendor instructions.
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by Apr 15, 2022.
Official 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.
Affected products (as reported)
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1000776
- https://blog.assetnote.io/2021/11/02/sitecore-rce/
- http://packetstormsecurity.com/files/164988/Sitecore-Experience-Platform-XP-Remote-Code-Execution.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42237 government-resource