CVE-2021-42237
Published: March 25, 2022
Official Description
Sitcore XP contains an insecure deserialization vulnerability which can allow for remote code execution.
CISA KEV Advisory
Sitecore XP Remote Command Execution Vulnerability
Sitcore XP contains an insecure deserialization vulnerability which can allow for remote code execution.
Apply updates per vendor instructions.
Risk Analysis
Sitecore XP contains an insecure deserialization vulnerability that can lead to remote code execution. This flaw allows an attacker to execute arbitrary code by manipulating serialized objects. This is a high-severity issue with a very high exploitation likelihood (EPSS 0.94374) and is actively exploited.
This vulnerability is actively exploited in the wild and is listed in CISA's Known Exploited Vulnerabilities Catalog. The flaw is remotely exploitable, allowing for arbitrary code execution.
Apply the latest security patches for Sitecore XP to address the insecure deserialization vulnerability. Implement secure deserialization practices and validate all deserialized data.
Technical Analysis
CVE-2021-42237 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2021-42237 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-42237 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1